content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Homework Help
Posted by sam on Wednesday, April 11, 2012 at 10:23pm.
can you show me step by step how to factor 15x^2-14x-8
• math - Reiny, Wednesday, April 11, 2012 at 10:35pm
I don't know what method you are learning.
One of the popular methods these days seems to be
the "decomposition" method
m... | 4 | [
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investigating an operator
January 15th 2012, 06:18 AM #1
Newbie
Joined
Jan 2011
Posts
24
investigating an operator
Hello!
I have a problem that comes in two parts.
(1) $H$ is a Hilbert space with orthonormal basis $\{e_k\}$. We are given a positivie strictly increasing sequence $\{\alpha_k\}$wi... | 5 | [
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Question about planes
April 25th 2010, 08:27 AM #1
Junior Member
Joined
Oct 2009
Posts
31
Question about planes
If we have to find the equation of the plane determined with two lines for example
$l_1 : \frac{x-5}{13}=\frac{y-6}{1}=\frac{z+3}{-4}$
$l_2 : \frac{x +3}{6}=\frac{y+2}{7}=\frac{z-4}{-3}... | 4 | [
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... | 32,602 | 32602 | |
derivative of integral
April 6th 2011, 01:21 PM #1
Newbie
Joined
Apr 2011
Posts
2
derivative of integral
Hi all,
I am new to the forum.
I have an integral that I am using, and I am unsure if I am computing the derivative of it correctly. I want to take the derivative of the following expression... | 4 | [
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-0.... | 32,603 | 32603 | |
Homework Help
Posted by jayla on Saturday, April 2, 2011 at 10:44pm.
sandra wrote the sequence below
2,5,10,17,...
which equation represents the rule for finding the nth term of this equation
• math - Reiny, Saturday, April 2, 2011 at 11:01pm
did you notice that each term is one larger than a perfect square,... | 4 | [
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Math Help
September 18th 2010, 10:37 AM #1
Newbie
Joined
Sep 2010
Posts
12
Limits
I am having a problem with the absolute value problem when using limits. I don't know if I am right but I think that both of the questions lead to an answer of zero; however, I am not sure.
please help
lim absol... | 4 | [
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7.3.1 Arithmetic & Geometric Sequences
Arithmetic and Geometric Sequences
Number patterns involving whole numbers, fractions, and decimals are also a common topic in elementary mathematics. In many cases, the patterns of interest take the form of sequences, or lists.
Table 7.1 presents examples of two types of numb... | 4 | [
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How high and how far problem?
March 13th 2011, 09:56 AM
Smokinoakum
How high and how far problem?
Hi all... could someone check me here. I have the right process I think, but I'm not 100% sure.
Here is the problem...
A student stands a certain distance from a building and measures the angle to the top ... | 4 | [
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the encyclopedic entry of onto (so/sth)
This article is about rotations in three-dimensional Euclidean space. For rotations in higher dimensions, see orthogonal group.
In
mechanics
and
geometry
, the
rotation group
is the
group
of all
rotations
about the origin of 3-dimensional
Euclidean space R^3
unde... | 4 | [
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0.096679... | 32,608 | 32608 | |
Perpendicular distance between two lines
November 30th 2008, 01:57 AM #1
Junior Member
Joined
May 2008
Posts
61
Perpendicular distance between two lines
The line L1 passes through the pt A, whose position vector is i-j-5k
and is parallel to the vector i-j-4k. The line L2 passes through the
point ... | 5 | [
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... | 32,609 | 32609 | |
finding the shaded area of a triangle
August 13th 2010, 10:19 AM #1
Newbie
Joined
Aug 2010
Posts
8
finding the shaded area of a triangle
i need help with this problem. i have absolutely no clue how to solve it.
Consider the shaded region outside the sector of the circle of radius 8 meters and inside... | 4 | [
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Annuity Problem
September 1st 2011, 09:04 PM
Diamondlance
Annuity Problem
I'm studying for actuarial exam FM/2, and want to verify my calculations with someone. The problem is as follows: "Jerry will make deposits of 450 at the end of each quarter for 10 years. At the
end of 15 years, Jerry will use the fund... | 5 | [
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... | 32,611 | 32611 | |
Solving for volume of rectangular prism
November 27th 2011, 09:09 AM #1
Member
Joined
Oct 2008
Posts
131
Solving for volume of rectangular prism
If a rectangular prism has faces with areas of 8, 10, and 20 units squared, then what is its volume? The answer is 40. How do I know which side length (length, ... | 4 | [
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help! i cant figure out this problem for the life of me!
4/9(x+3)=g solve for x. state any restrictions on the variables.
1. multiply both sides by 9/4 2. subtract 3 from both sides you're done.
Is your question $g = \frac{4}{9(x+3)}$ Given: $g = \frac{4}{9(x+3)}$ Multiply by (x+3) on both sides: $g(x+3) = \frac{4}{9... | 4 | [
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... | 32,613 | 32613 | |
Problem Solving
December 3rd 2009, 09:19 PM #1
Newbie
Joined
Dec 2009
Posts
5
Problem Solving
Please help me out with this question.
The product of two numbers that differ by one is equal to one,
Without finding the two numbers, determine the difference of their cubes.
Thank You in Advance
... | 4 | [
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Integration problem
June 1st 2010, 11:56 AM
ixi
Integration problem
It's the integration of k(1+x)^-4 from 0 to infinity which is equal to 1. Solve for k.
My solution is ---
Let u=1+x du=dx
Then, it's k(-3(1+x)^-3) from 0 to infinity, which means k=1/3
But the solution manual says it's
(-k/... | 5 | [
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[SOLVED] Finding the limit of a sequence.
I need to find the limit of {(1 + $\frac{1}{2n})^n$}, and justify my answer.
I know that $\stackrel{\lim}{n\rightarrow\infty}$ (1 + $\frac{1}{n})^n$ = e.
Can I use $\frac{n}{2}$ for my 'n,' so I get:
$\stackrel{\lim}{n\rightarrow\infty}$ (1 + $\frac{1}{2(\fra... | 4 | [
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Richard Feynman's Functional Integral 5 - Radiation In An Oven
This is the fifth part of a ten-part post on the foundation of our understanding of high energy physics, which is Richard Feynman's functional integral. The first four parts are Action, Multiple
Molecules, Electromagnetism, and Action For Fields, and the fo... | 4 | [
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... | 32,617 | 32617 | |
2nd order DE's with constant coefficients.
January 8th 2011, 03:31 PM
hejmh
2nd order DE's with constant coefficients.
1- How can I solve this equation? y''+4y'=0
2-What is the diffrential equation of type y''+ay'+by=0 which has the solution of:
e^(3x) and xe^(3x)
Thanks for your help.
January 8th... | 5 | [
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Homework Help
Posted by lau on Monday, May 24, 2010 at 12:43am.
A soccer player kicks a rock horizontally off a 41.7 m high cliff into a pool of water. If the player hears the sound of the splash 3.08 s later, what was the initial speed given to the rock? Assume
the speed of sound in air to be 343 m/s.
• physics - ... | 4 | [
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quadratic equations word problems geometry (math 20 pure)
July 8th 2008, 07:31 PM #1
Newbie
Joined
Jul 2008
Posts
12
quadratic equations word problems geometry (math 20 pure)
Hey! I'm having trouble with a certain question.
A rectangular field is to be enclosed by 600 m of fence.
a) What dimensi... | 4 | [
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... | 32,620 | 32620 | |
Prove by Induction
October 11th 2007, 10:45 PM #1
Member
Joined
Oct 2007
Posts
145
Prove by Induction
$\sum_{n=0}^\infty {{n+k} \choose k}\ x^n = {1 \over {(1-x})^{k+1}}$
where $|x| < 1$
Can anyone lead me here? Such questions get the better of me all the time. How should I go about improving?
... | 5 | [
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Formulating Differential equations for RLC circuit with switches.
April 28th 2012, 02:16 AM #1
Junior Member
Joined
Oct 2007
Posts
52
Formulating Differential equations for RLC circuit with switches.
Hello,
For Question 2 (attached) I am trying to figure out how to go about answering part a, but I a... | 4 | [
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Homework Help
Posted by Ronnie on Saturday, June 19, 2010 at 1:06pm.
I have been struggling with this problem I cannot get the right answer. Please give me the steps to solve this problem.
Let f(x)= (2x-9)(x^2 + 6)
(A) Find the equation of the line tangent to the graph of f(x) at x=3
(B) Find the values(s) of x whe... | 4 | [
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Parametric Calc
April 2nd 2012, 02:12 PM #1
Junior Member
Joined
Mar 2012
From
USA
Posts
28
Thanks
2
Parametric Calc
Given that $y=x^2-x$, ${dx}/{dt}>0$ and that the particle is traveling at a constant $2\sqrt{10}$, what is dy/dt?
So far I've used a formula for speed as $\sqrt{(dy/dt)^2+(dx/... | 5 | [
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-... | 32,624 | 32624 | |
chain rule problem, with 2 constants!
December 11th 2012, 04:40 AM #1
Junior Member
Joined
Jul 2012
From
Bangladesh
Posts
55
chain rule problem, with 2 constants!
$\frac{d}{dw}{[a\cos^{2}\pi w +b\sin^{2}\pi w ]}$ (a,b constants)
How do I go about this?
The constant "a" or "b" independent fr... | 5 | [
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... | 32,625 | 32625 | |
An interesting probability question
January 24th 2008, 05:51 AM #1
An interesting probability question
Reading through my newly acquired statistics book, I came across the following question:
If a weather forecaster predicts 25% chance of rain for Saturday, and 25% for Sunday as well, does that mean there's ... | 4 | [
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An Improved Computer Vision Method for White Blood Cells Detection
Computational and Mathematical Methods in Medicine
Volume 2013 (2013), Article ID 137392, 14 pages
http://dx.doi.org/10.1155/2013/137392
Research Article
An Improved Computer Vision Method for White Blood Cells Detection
Departamento de Electrónica, ... | 4 | [
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0.07177734375,
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-0.0137939453125,
-0.07421875,
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0.0233154296875,
0.07421875,
-0.1298828125,
-0.02392578125,
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0.0466... | 32,627 | 32627 | |
12th Grade Calculus
Posted by Liz on Tuesday, December 14, 2010 at 10:15pm.
Find d^2y/dx^2 by implicit differentiation.
x^(1/3) + y^(1/3) = 4
I know that first you must find the 1st derivative & for y prime I got 1/3x^(-2/3) + 1/3y^(-2/3) dy/dx = 0
Then for dy/dx I got
dy/dx = [-1/3x^(-2/3)] / [1/3y^(-2/3)]
I thi... | 5 | [
-0.0230712890625,
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-0.0205078125,... | 32,628 | 32628 | |
Exponential
March 20th 2008, 12:27 AM #1
Newbie
Joined
Jan 2008
Posts
2
Exponential
Question: What digit is found in the units place of 7 to the 1000th power ?
Can 7^1000 be broken down to 7^100 + 7^10?
3.23447651 × 10^84 + 282 475 249
so would the answer be 2?
Woah
Une française
... | 5 | [
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0.0537109375,
-0.10... | 32,629 | 32629 | |
Probability that it will rain
May 24th 2009, 06:21 PM
foreverbrokenpromises
Probability that it will rain
Statistics show that in my city it rains one day out of every four. Also, if it has rained one day, then two times out of three it will rain the next day. If today is fair, the probability that
tomorrow ... | 4 | [
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0.103515625,
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0.02734375,
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... | 32,630 | 32630 | |
Defining a function [Mathematica]
September 28th 2008, 10:12 AM
bkarpuz
[SOLVED] Defining a function [Mathematica]
I want to define the following function:
$\varphi:\mathbb{N}\to\mathbb{N}\times\mathbb{N},$
..... $\ell$.. $\to$.. $\varphi(\ell):=\begin{cases}(m,n),&(-1)^{m+n}=1\\ (n,m),&(-1)^{m+n}=-1,\en... | 5 | [
0.011474609375,
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0.0233154296875,
-0.006195068359375... | 32,631 | 32631 | |
proof that {(1+x/n)^n} is bounded
March 5th 2009, 11:41 AM
nxd
proof that {(1+x/n)^n} is bounded
Hello,
how can I prove that the set E(x) = { (1+x/n)^n} is bounded ? (n is a natural number and x is a positive real number)
I had already proven that the set has no largest element using a consequence of th... | 5 | [
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limits using l'hospital's formula?
December 4th 2008, 07:48 PM #1
Newbie
Joined
Dec 2008
Posts
9
limits using l'hospital's formula? (SOLVED!! THANKS!!)
i'm really struggling with l'hospital's formula, and i'll get help in person but this homework is due tonight.
limit of ((e^x)-1)/sin(7x) as x --> 0... | 5 | [
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Stuck on Algebra 1
Posted by TyTy on Saturday, January 5, 2008 at 5:34pm.
This is kind of like the first question I asked, and I'm still having a little trouble on it.
The Ordered pairs in each exercise are for the same direct variation.
Find the missing value.
(-2,8) and (x,12)
I'm not sure how to work out the pr... | 4 | [
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-0.0233154296875,
-0.0795898437... | 32,634 | 32634 | |
An Optimal Control Problem of Forward-Backward Stochastic Volterra Integral Equations with State Constraints
Abstract and Applied Analysis
Volume 2014 (2014), Article ID 432718, 16 pages
http://dx.doi.org/10.1155/2014/432718
Research Article
An Optimal Control Problem of Forward-Backward Stochastic Volterra Integral ... | 4 | [
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... | 32,635 | 32635 | |
ew
And I'm going to quit.... maybe... OCD can be a *bitch* sometimes. (Except when it's fun. Or !both! ... sigh ... Apologies in advance...)
Quote:
Originally Posted by
GrogNerd
fair enough... but then the chances of winning leave the realm of statistics and enters the world of calculus and limits ->100%, but ne... | 5 | [
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Need some help on differentiation
June 14th 2006, 06:56 PM
c_323_h
Need some help on differentiation
Differentiate:
1. $F(y)=(\frac{1}{y^2}-\frac{3}{y^4})(y+5y^3)$
2. $y=\frac{t^2}{3t^2-2t+1}$
3. $y=\frac{v^3-2v\sqrt{v}}{v}$
I tried these and got 2 pages worth of arithmetic for one problem so... | 5 | [
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Prove by induction that: n(n^2 + 3n+2) is divisible by 6
November 13th 2009, 05:14 PM
differentiate
Prove by induction that: n(n^2 + 3n+2) is divisible by 6
Prove by induction that: $n(n^2 + 3n+2)$ is divisible by 6, for n>0
For n =1,
1(1^2 + 3x1 + 2) = 6
true for n =1
assume true for n = k
... | 4 | [
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0.0... | 32,638 | 32638 | |
Exact Explicit Solutions and Conservation Laws for a Coupled Zakharov-Kuznetsov System
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 461327, 5 pages
http://dx.doi.org/10.1155/2013/461327
Research Article
Exact Explicit Solutions and Conservation Laws for a Coupled Zakharov-Kuznetsov System
Depa... | 5 | [
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0... | 32,639 | 32639 | |
Differentiation of Algebraic Function
October 21st 2008, 07:13 PM #1
Newbie
Joined
Feb 2006
Posts
16
Differentiation of Algebraic Function
Hello all.
I'm starting calculus and I'm stumped by this exercise. I've arrived at multiple answers only to realise that, according to my text, I'm lost.
Fi... | 5 | [
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-0.00239562... | 32,640 | 32640 | |
Area of Triangle using cross product
June 1st 2009, 03:05 PM #1
Member
Joined
Nov 2008
From
Ontario
Posts
80
Area of Triangle using cross product
A triangle has vertices A(-2,1,3), B(7,8,-4), and C(5,0,2). Determine the area of triangle ABC.
Vector AB = B-A = [9,7,-7]
Vector AC = C-A = [7, -... | 4 | [
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0.056884765625,
-0.013244628906... | 32,641 | 32641 | |
Linear System of Equations
May 15th 2010, 04:47 PM #1
Junior Member
Joined
Mar 2010
Posts
51
Linear System of Equations
I'm having some trouble with Linear Systems of Equations, I get the basic concept but it would be helpful if someone could do the following problem step by step.
$u'\; =\; 4u\; -\;... | 4 | [
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Eigenvector
1. August 5th 2008, 09:22 AM #1
Eigenvector
Last edited by jasonmark; August 5th 2008 at 10:06 AM.
2. August 5th 2008, 10:03 AM #2
To get from here
$\bigg[\begin{array}{cc}2&2\\-1&5\end{array}\bigg]\bigg[\begin{array}{c}v_1\\v_2\end{array}\bigg]=\bigg[\begin{array}{c}3v... | 4 | [
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0.01904296875,
-0.036376953125,
0.0189208984375... | 32,643 | 32643 | |
the
The Intersection of Two Circles
Two circles in a plane intersect in zero, one, two, or infinitely many points. The latter case occurs only in the case of two identical circles. The first case (zero points of intersection) occurs
whenever the distance between the centers of the circles is greater than the sum of ... | 5 | [
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Least squares problem
June 5th 2008, 01:39 PM #1
Least squares problem
I'm having trouble to understand the consign of the exercise. It says "Approximate the data of the following table with a model of the form $f(x)$~ $ae^{bx}$ in the meaning of least squares for
the function $ln(f(x))$.
$\begin{array}{c... | 4 | [
0.038818359375,
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-0.... | 32,645 | 32645 | |
I have got myself in a pickle. :( [Word problem Test]
October 2nd 2008, 07:00 PM #1
Banned
Joined
Oct 2008
Posts
23
I have got myself in a pickle. :( [Word problem Test]
I have a Word Problem Test due tom. at 8 am.( only 10 problems ) First of all this is my first semester at a university and I am pretty... | 4 | [
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... | 32,646 | 32646 | |
Rumour problem (logistic differential equations)
October 14th 2008, 11:10 PM #1
Junior Member
Joined
Feb 2008
Posts
60
Rumour problem (logistic differential equations) - somewhat urgent
Hello. I'm currently stuck on a problem that I can't seem to work out. It's quite complex and difficult (for me anyway)... | 5 | [
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-0.003... | 32,647 | 32647 | |
Natural log and derivates
October 16th 2008, 02:45 PM
ur5pointos2slo
Natural log and derivates
I am trying to find dy/dx
The problem states: e^y = 1 + (X^2)(y)..My calculus book doesn't really explain how to get the derivative in terms I am making any sense of.
Can I rewrite this as?
y= ln(1+(x^2)(... | 5 | [
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0.06884765625,
-0.10888671875,
0.044433... | 32,648 | 32648 | |
Homology Groups
December 6th 2010, 07:09 AM #1
Super Member
Joined
Aug 2009
From
Israel
Posts
976
Computing Homology Groups
Hey, I've been reading Hatcher and doing the exercises, couldn't answer this one:
(p.132 ex. 17)
Tried various directions but I'm pretty much lost. Any help will be ... | 5 | [
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... | 32,649 | 32649 | |
Product of Complex Numbers proof
December 8th 2010, 01:45 PM
jstarks44444
Product of Complex Numbers proof
If x1 + iy1 is an element of C and has an absolute value r1 and argument phi1, and
x2 + iy2 is an element of C and has absolute value r2 and argument phi2, then
the product (x1 + iy1)(x2 + iy2) ha... | 4 | [
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-0.068359375,
0.0130004882812... | 32,650 | 32650 | |
Asymptotic Stability of the Golden-Section Control Law for Multi-Input and Multi-Output Linear Systems
Journal of Applied Mathematics
Volume 2012 (2012), Article ID 407409, 11 pages
http://dx.doi.org/10.1155/2012/407409
Research Article
Asymptotic Stability of the Golden-Section Control Law for Multi-Input and Multi-... | 5 | [
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-0... | 32,651 | 32651 | |
Partitioning a Sum of Consecutive Odd Numbers and Perfect Cuboids
December 18th 2012, 12:16 PM
Arctangent
Partitioning a Sum of Consecutive Odd Numbers and Perfect Cuboids
A little background:
Say you have a pythagorean triple, which is a diophantine solution to the pythagorean theorem:
$a^2 + b^2 = c^... | 4 | [
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0.0177001953125,
-0.0113525... | 32,652 | 32652 | |
Basic probablity question.
May 11th 2009, 12:06 PM
puzzledwithpolynomials
Basic probablity question.
Three coins are tossed. Find the probabilikty that they all land heads up for each known condition.
P(X|Y)=P(X)*P(Y)/P(Y)
6. The first coin shows a head.
My work: 2*2*2=8 possibilities
8 Pr 2=56... | 4 | [
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0.059814453125,
-0.083984375... | 32,653 | 32653 | |
Help on differentiation
August 18th 2008, 10:27 PM #1
Junior Member
Joined
Jan 2008
Posts
29
Help on differentiation
$Q(x) = \frac{1}{\sqrt{2 \pi}} \int_x^\infty e^{- t^2/2} dt$
$P = Q( \sqrt{2a \cdot u^2} ) \cdot e^{au^2}$
what is the answer if we differentiate P w.r.t. $u^2$ ???
thanks
... | 5 | [
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0.00119781494140625,
0.0712890625,
0.0673828125,
0.0791015625,
0.07958984375,
0.0223388671875,
0.06640625,
0.0135498046875,
-0.003570556640625,
0.0244140625,
-0.0412597656... | 32,654 | 32654 | |
Problem 24
Let $f$ be continously differenciable on $\mathbb{R}$. Solve the integral equation: $[f(x)]^2 = \int_0^x [f(t)]^2+[f'(t)]^2dt$
I would much rather deal with a differential equation. Hopefully this works. $\frac{d}{dx}[f(x)]^2=\frac{d}{dx}\int_0^x [f(t)]^2+[f'(t)]^2dt$ $2[f(x)]f'(x) = [f(x)]^2+[f'(x)]^2$ $[f... | 5 | [
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0.0... | 32,655 | 32655 | |
Just started college an im already stuck..
January 21st 2013, 10:00 AM
madxnoob
Just started college an im already stuck..
So I started this class on Hydraulics an this math is getten to me... no clue how to do it and would very much appreciate some help... F = PxA, P = F\A, A = F\P.... so here we go.. If a forc... | 4 | [
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0.00628662109... | 32,656 | 32656 | |
Reduction math problem
May 12th 2008, 07:32 AM #1
Newbie
Joined
May 2008
Posts
4
Reduction math problem
Hi, I'm trying to solve this very simple reduction problem, but I just can't get my head around it.
Here it goes:
xy + x^2 / xy
It's supposed to be reduced, and my best bet is that the s... | 4 | [
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Bearing problem: Sine and cosine
March 17th 2013, 06:01 PM
KerkLu
Bearing problem: Sine and cosine
Two ship leave a port at the same time. The first ship sails on a course of 35° at 15 knots, while the second ship sails on a course of 125° at 20 knots. Find after 2 hours (a)distance between
the ship (b)the b... | 4 | [
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-0.03808593... | 32,658 | 32658 | |
Moment of inertia of a squARE lamina
As you say, the moment of inertia
I
(see
http://hyperphysics.phy-astr.gsu.edu/hbase/mi.html
) of the two rods where the axis of rotation passes through their center is
I = M·L^2/12
, so for two of them it is
M·L^2/6
.
For each rod parallel to the axis of rotation, the momen... | 5 | [
0.060791015625,
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Numerical Analysis of the Dislocation Density in Multicrystalline Silicon for Solar Cells by the Vertical Bridgman Process
International Journal of Photoenergy
Volume 2013 (2013), Article ID 706923, 8 pages
http://dx.doi.org/10.1155/2013/706923
Research Article
Numerical Analysis of the Dislocation Density in Multicr... | 4 | [
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0... | 32,660 | 32660 | |
Simultaneous Linear and Quadratic Equations
March 22nd 2009, 11:02 PM
22upon7
Simultaneous Linear and Quadratic Equations
Can someone please show me how to work through this type of sum?
Find the value(s) of $a$ such that the line with equation $y=x$ is tangent to the parabola with equation $y=x^2+ax+1$
... | 4 | [
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Mathematical Model
February 17th 2009, 09:38 AM #1
Newbie
Joined
Feb 2009
Posts
7
Mathematical Model
With 1000ft of fencing, a person wishes to fence a field into three parts as shown in the diagram. (The diagram is just a rectangle with it sectioned into three portions, y being height, x width)
How... | 4 | [
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Modeling Peer-to-Peer Botnet on Scale-Free Network
Abstract and Applied Analysis
Volume 2014 (2014), Article ID 212478, 8 pages
http://dx.doi.org/10.1155/2014/212478
Research Article
Modeling Peer-to-Peer Botnet on Scale-Free Network
^1Department of Computer Science and Technology, Xinzhou Teachers University, Xinzh... | 5 | [
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0.062255859375,... | 32,663 | 32663 | |
Problems of pseudoinverse and SVD in linear algebra
May 24th 2009, 06:13 PM #1
Junior Member
Joined
May 2009
Posts
71
Problems of pseudoinverse and SVD in linear algebra
I am trying to find the pseudo inverse and SVD as well as single values for a matrix:
Thus far I have been able to (this is conden... | 4 | [
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... | 32,664 | 32664 | |
vector calculus..cylindrical coordinates
September 10th 2009, 12:23 PM
holly123
vector calculus..cylindrical coordinates
how to you transform cartesian equations into cylindrical coordinates?
for example, write the following cartesian equation in cylindrical coordinates and graph:
x^2 + y^2 + (z-1)^2= 1
... | 4 | [
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-0.065917968... | 32,665 | 32665 | |
solve and graph
Simple. For the first inequality subtract two from each side, then divide by 8, you get x < -2, for the next one add two to each side, divide by four, and get x > 3. Then draw a number line from -2
to 3, make an open dot at the -2 and three point, draw a line inbetween them.
I'm confused htmlmaster... ... | 4 | [
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Homework Help
Posted by Anonymous on Monday, March 14, 2011 at 1:47pm.
Suppose a 6ft. man is 10 ft. away from a 24 ft. tall lamp post. If the person is moving away from the lamp post at at rate of 2 ft/sec, at what rate is the length of his shadow changing?
• Calculus - Reiny, Monday, March 14, 2011 at 2:03pm
... | 5 | [
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... | 32,667 | 32667 | |
isapurple.com
Trigonometry problems: Proving trigonometric identities
Trigonometry problems and trigonometric expressions can be simple and very complex. Very often, complex trigonometric expressions can be equivalent to less complicated expressions. Process of
verifying that two trigonometric expressions are equivale... | 4 | [
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... | 32,668 | 32668 | |
Homework Help
Posted by Sean on Sunday, March 15, 2009 at 11:34pm.
If there is a recursively defined sequence such that
a
[1]
= sqrt(2)
a
[n + 1]
= sqrt(2 + a
[n]
)
Show that a
[n]
< 2 for all n ≥ 1
• Math - Reiny, Sunday, March 15, 2009 at 11:54pm
a1 = √2
a2 = √(2 + √2)
a3 = √(2 + √(2 + √2)... | 4 | [
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0.03173828125,
0.0137939453125,... | 32,669 | 32669 | |
need my work checked plz :)
October 6th 2008, 09:35 PM #1
Newbie
Joined
Sep 2008
Posts
21
need my work checked plz :)
u= ln(sqrt(x^2+y^2))
u(x) = x / (2sqrt((x^2+y^2))
u(xx) = (1-2x^2)/(2(sqrt(x^2+Y^2))^3)
u(y)= y / (2sqrt((x^2+y^2))
u(yy)= (1-2y^2)/(2(sqrt(x^2+Y^2))^3)
i havent ... | 5 | [
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Adaptive High Order Sliding Mode Controller Design for Hypersonic Vehicle with Flexible Body Dynamics
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 357685, 11 pages
http://dx.doi.org/10.1155/2013/357685
Research Article
Adaptive High Order Sliding Mode Controller Design for Hypersonic Vehicle wi... | 4 | [
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-0.028808593... | 32,671 | 32671 | |
Eigenvalue question
August 2nd 2009, 12:07 PM #1
Eigenvalue question
Q1: Let $T:M_{2,2}\rightarrow{M_{2,2}}$ be represented by
$T\left(\begin{bmatrix}a&b\\c&d\end{bmatrix}\right)$$=<br /> \begin{bmatrix}a-c+d&b+d\\-2a+2c-2d&2b+2d\end{bmatrix}$ .
Find the eigenvaulues and eigenvectors of $T$ relative to... | 4 | [
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-0.020263671875,
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0.04931640625,
0.000274658203125,... | 32,672 | 32672 | |
could somebody please help me with this
I attached the diagram below. By the way, the triangle is AMN not ABC Note that the altitude of an equilateral triangle bisects one of it's angles and divides the base it hits in two equal parts.
This means that $MH = \frac {1}{2} (7m - 1)$ Also, since $\triangle AMN$ is equilate... | 4 | [
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-0... | 32,673 | 32673 | |
Gaussian integers: GCD and Unique factorization
June 5th 2008, 04:07 PM #1
Newbie
Joined
Jun 2008
Posts
2
a) Show that the algebraic integers of the form r+s√(-3), where r and s are rational numbers, are the numbers of the form a+bw, where a and b are integers and where w=(-1+√(-3))/2. Numbers of
this... | 4 | [
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... | 32,674 | 32674 | |
The average number of sequences of programs.
May 24th 2013, 05:09 PM #1
Newbie
Joined
Apr 2012
From
Rio de Janeiro, Brazil
Posts
13
The average number of sequences of programs.
Hi.
This thread is related with another one I already posted:
The average number of tries
And Chiro helped me.
... | 4 | [
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0.038330078125,
-0.037841796875,
-0.095703... | 32,675 | 32675 | |
geometric sequence problems
November 22nd 2009, 03:52 PM #1
Junior Member
Joined
Sep 2008
Posts
34
geometric sequence problems
Find the number of terms in the sequence
512, -256 , 128 , ......, -1
I got the first one correct, but i'm not sure if complete the question in proper steps due to my m... | 4 | [
-0.07958984375,
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-0.00811767578125,
-0.11083984375,... | 32,676 | 32676 | |
Physics Forums - View Single Post - Simple calculus volumes integration
1. The problem statement, all variables and given/known data
Find the volume of this equation, revolved around x axis
2. Relevant equations
y=x^2
y^2=x
3. The attempt at a solution
1) (pi)(r^2)
2) r = x^2
3) (pi)((x^2)^2)
4) (pi)(x^4)
now to i... | 5 | [
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... | 32,677 | 32677 | |
Derivative of trig function to equal zero.
February 1st 2013, 08:46 PM
mcleja
Derivative of trig function to equal zero.
Hi, everyone,
I have the trig function g(x)=cos^4(x)-cos^2(x) and i have found g'(x) to be -4sin(x)cos^3(x)+2sin(x)cos(x). how would i find when the derivative is equal to zero? I started... | 4 | [
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0.019775390625,
0.033203125,
-0.... | 32,678 | 32678 | |
Inergration With Partial Fractions
September 4th 2008, 09:22 PM #1
Junior Member
Joined
Feb 2008
Posts
26
Inergration With Partial Fractions
$\int \frac {x-4}{x^2+2x+5}dx$
Answer: $\frac{1}{2}ln(x^2+2x+5)+\frac{3}{2}\arctan(\frac{x +1}{2})+C$
Well, this one I'm not sure how to even start. I can... | 5 | [
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0.0966796875,
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0.035888671875,
... | 32,679 | 32679 | |
Exponential Synchronization for Neutral Complex Dynamical Networks with Interval Mode-Dependent Delays and Sampled Data
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 639580, 21 pages
http://dx.doi.org/10.1155/2013/639580
Research Article
Exponential Synchronization for Neutral Complex Dynamical ... | 4 | [
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-... | 32,680 | 32680 | |
Finding the Limiting Distribution
November 27th 2012, 03:23 PM #1
Newbie
Joined
Nov 2012
From
United States
Posts
3
Finding the Limiting Distribution
For the pdf f(x) = (θ^2+θ)*(x^(θ-1))*(1-x), 0<x<1,
let Y[1]<Y[2]<...<Y[n] denote the corresponding order statistics.
Find β so that W[^n] = (n... | 5 | [
-0.10302734375,
-0.07568359375,
-0.0223388671875,
-0.001129150390625,
0.0255126953125,
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0.0123291015625,
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0.103515625,
-0.00762939453125,
0.039794921875,
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0.0291748046875,
-0.018432617187... | 32,681 | 32681 | |
Solving Second Order Differential Equations using Runge Kutta
narayanjr
From what I have read you cant do second order ODE using runge kutta without breaking it into a system of first order ODEs so thats what I tried.
I tried:
d2y/dx2 + xy = 0
dy/dx = z, y(0) = 1
dz/dx + xy = 0
dz/dx = -xy, z(0) = 0
I dont know... | 4 | [
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Matrix transformation
How do I start this question? Do I let P equal the 2x2 matrix abcd?
I would go about it by showing that A doesn't have 2 linearly independent eigenvectors. Then there's a theorem that states you can't diagonalize an n x n matrix unless you have n linearly independent
eigenvectors. Make sense?
I ... | 5 | [
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0.017578125,
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0.0... | 32,683 | 32683 | |
Predicative and Impredicative Definitions
The distinction between predicative and impredicative definitions is today widely regarded as an important watershed in logic and the philosophy of mathematics. A definition is said to be
impredicative if it generalizes over a totality to which the entity being defined belongs... | 4 | [
0.0087890625,
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0.0625,
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0.07861328125,
-0.01000976... | 32,684 | 32684 | |
Horizontal & Vertical Asymptotes
November 17th 2007, 06:57 PM #1
Horizontal & Vertical Asymptotes
Please help,
Find the horizontal & vertical asymptotes (if any) for: h(x)=3/(x-6)(2x-2)
What I think the answer is: No horizontal asymptote, and the vertical would be:
6 & 2??
thank you!!
incor... | 4 | [
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... | 32,685 | 32685 | |
Wolfram Demonstrations Project
Peregrine Soliton with Controllable Center in the Causal Interpretation of Quantum Mechanics
The standard "self-focusing" nonlinear Schrödinger equation, also known as the Gross–Pitaevskii equation, appears in wave propagation through nonlinear media such as signal transmission in optica... | 4 | [
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-0.1... | 32,686 | 32686 | |
Finding square roots mod n
Hi, how can I find all four solutions to x^2 ≡ 133 (mod 143)?
Last edited by posix_memalign; October 4th 2009 at 07:39 AM.
I was looking for the 'right' way of doing this, i.e. mathematical approach. There is no 'right' way, but there are several approaches that ease the pain. Notice that 1... | 5 | [
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... | 32,687 | 32687 | |
Coursework Help Nth Term!!!
November 13th 2005, 03:49 AM #1
Newbie
Joined
Nov 2005
From
UK
Posts
3
I am confused
I am trying to find a formula to link these numbers for a part of my GCSE coursework (i.e nth term) could someone please show me how i can do this??
1 2 3 4 5
3 6 10 15 21....... | 4 | [
-0.09033203125,
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-0.040283203125,
-0.03... | 32,688 | 32688 | |
Homework Help
Posted by gab on Monday, July 23, 2012 at 1:27pm.
The MePhone, a new smartphone, is being introduced in the Louisville area. The manufacturer plans to sell 30,000 phones during the first week and expects sales to increase by 8% each week after that
find the equation, determine if its aritmetic or geometr... | 4 | [
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0.078125,
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0.0257568359375,
0.109375,
-0.04931640625,
-0.053955078125,
-0.1... | 32,689 | 32689 | |
Calc-Based Physics
Number of results: 61,725
physics calc based
In the product F = qB (vectors), take q = 2 (neglecting the units of charge, q) and v = 2.0 i + 4.0 j + 6.0 k and F = 4.0 i + (-20 j) + 12 k . What then is B in unit-vector notation if Bx=By ?
January 24, 2010 by hannah
business
I need help understandind... | 4 | [
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0.03466796875,
... | 32,690 | 32690 | |
Simple Geometric Series
November 21st 2009, 09:41 AM #1
Simple Geometric Series
$\sum_{k=1}^\infty (\frac{2}{3})^{k+2}$
This is what I did.
$\sum_{k=1}^\infty \frac{4}{9}*(\frac{2}{3})^{k}$
$a=\frac{4}{9}, r=\frac{2}{3}<1$
Threfore series converges to
$\frac{4}{3}$
This seems correct to ... | 4 | [
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... | 32,691 | 32691 | |
[SOLVED] relation question
September 8th 2009, 06:34 PM
seld
[SOLVED] relation question
I think this goes here.
$a \epsilon \mathbb{R} \text{ and }0<a<1 \Rightarrow<br /> 0<1-\sqrt{1-a}<a$
I'm not sure where to start with this proof, rather i'm not sure where to start with this proof if I do not use th... | 4 | [
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-0.085... | 32,692 | 32692 | |
Dividing by variable and taking square root of inequalities
February 6th 2013, 07:45 AM
mathDad
Dividing by variable and taking square root of inequalities
How does one solve $4x \le x^3$?
This is actually a two part question. First, you can't really divide both sides by $x$, since it could be negative (or ... | 4 | [
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-0.06... | 32,693 | 32693 | |
Double Pendulum Nightmare
September 17th 2008, 03:51 AM #1
Newbie
Joined
Aug 2008
Posts
11
Hi all >> see attached images of pendulum and 2nd order model
Currently working on a problem, creating a model for a double pendulum system, we have been given the initial non-linear system of 2x 2nd order equa... | 4 | [
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0.025390625,
0.000278472900390625,
0.0027313232421875,
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0.017578125,
0.004058837890625,
-0.0810546875,
-0.033203125,
0.05517578125,
-0.0281982421875,
0.061279296875... | 32,694 | 32694 | |
Homework Help
Posted by mary on Wednesday, September 26, 2012 at 10:46pm.
making linear equation from word problem
An airspeed indicator on aircraft is affected by changes in atmospheric pressure at different altitudes. A pilot can estimate the true airspeed by observing the indicated airspeed and adding it about
2% ... | 4 | [
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0.08837890625,
-0.046142578125... | 32,695 | 32695 | |
Flip flop mod counter
surfy14
I made my transition table, k-maps, and equations, but not sure if they are right.
Here are my final next state equations derived from my k-maps
Q0 next state = Q0 NOT
Q1 next state = Q0
Q2 next state = Q1 NOT * Q0 + Q1 * Q0 NOT
Using Q+ = J QNOT + KNOT Q
J2 = Q1 NOT
K2 = Q1
I dont... | 4 | [
-0.0791015625,
0.03466796875,
0.0299072265625,
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0.00138092041015625,
0.05322265625,
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0.0439453125,
0.03466796875,
-0.09423828125,
0.09375,
-0.091796875,
0.057617187... | 32,696 | 32696 | |
Math Help
December 27th 2011, 03:03 AM #1
Newbie
Joined
Dec 2011
Posts
19
integral
Find the value of $\int \frac{1}{(1+x^2)^{3 \over 2}}dx$
I have been trying to solve this question since many years but I can't reach anywhere...
I have tried substituting $x^2$ , $x^2+1$ and $1/(x^2+1)$ but I d... | 5 | [
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the encyclopedic entry of Functional power
''This article concerns power rules for computing the derivative in calculus
In mathematics, the power rule is a method for differentiating expressions involving exponentiation (the power operation). The most basic such rule is the elementary power rule which states that ... | 4 | [
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Fractional Order Models of Industrial Pneumatic Controllers
Abstract and Applied Analysis
Volume 2014 (2014), Article ID 871614, 9 pages
http://dx.doi.org/10.1155/2014/871614
Research Article
Fractional Order Models of Industrial Pneumatic Controllers
^1Dynamical Systems & Control (DSC) Research Lab., Department of ... | 4 | [
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