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help-10
cc7836ffa38e41b9b591eb97c223fc95
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Alfie
03/22/2022 20:00:05
You are putting brackets in the wrong places
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help-10
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Miggle
03/22/2022 20:00:14
wait let me write it out
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Remavas
03/22/2022 20:00:55
$e^{\sqrt{x}} \neq \sqrt{e^x}$
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TeXit
03/22/2022 20:01:08
**Remavas**
https://cdn.discordapp.c…980977336321.png
373884980977336321.png
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Alfie
03/22/2022 20:01:09
https://cdn.discordapp.c…9897/unknown.png
unknown.png
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Alfie
03/22/2022 20:01:11
Here is my paint drawing
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Alfie
03/22/2022 20:01:14
ah, beat to it
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Alfie
03/22/2022 20:01:15
lol
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Miggle
03/22/2022 20:01:18
ah yes
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Miggle
03/22/2022 20:01:42
fair
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Remavas
03/22/2022 20:01:43
LaTeX saves the day yet again
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help-10
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Miggle
03/22/2022 20:01:55
I see so this doesnt work
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help-10
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Miggle
03/22/2022 20:02:11
as in when the power goes to x it cant apply to the whole thing
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Remavas
03/22/2022 20:02:14
You can type bs in it, but your profs will like it, because it's *beautiful top of the art* bs
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help-10
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Miggle
03/22/2022 20:03:12
alright so
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help-10
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Miggle
03/22/2022 20:03:23
https://cdn.discordapp.c…4005/unknown.png
unknown.png
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help-10
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Miggle
03/22/2022 20:03:42
if this is the case and id like to differentiate the LHS how would I go about it?
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help-10
cc7836ffa38e41b9b591eb97c223fc95
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Miggle
03/22/2022 20:04:38
chain rule?
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help-10
cc7836ffa38e41b9b591eb97c223fc95
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Miggle
03/22/2022 20:05:24
oh wait nvm theres a yt vid on it
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Miggle
03/22/2022 20:05:29
ty anyways for all the help so far
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Miggle
03/22/2022 20:05:30
.close
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martiniman31
03/22/2022 20:13:23
I've got some difficult questions I need help trying to solve from my linear algebra and differential equations class If someone could help me out with them that would be awesome! I have no clue where to start with them.
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Alfie
03/22/2022 20:13:38
Send the problem!
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martiniman31
03/22/2022 20:13:52
https://cdn.discordapp.c…03-22_190342.jpg
Screenshot_2022-03-22_190342.jpg
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martiniman31
03/22/2022 20:13:52
https://cdn.discordapp.c…03-22_190506.jpg
Screenshot_2022-03-22_190506.jpg
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martiniman31
03/22/2022 20:14:07
these two are stumping me
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Alfie
03/22/2022 20:14:20
holy hahaha
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martiniman31
03/22/2022 20:14:27
ikr
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Alfie
03/22/2022 20:14:28
Inverting anything larger than a 3x3 🤨
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Alfie
03/22/2022 20:15:24
Wish I could help here, but haven't done anything larger than 3x3, and definitely haven't investigated relationship between determinant and transposed determinants (and multiplied determinants) like that!
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martiniman31
03/22/2022 20:15:28
well they are exam review problems... dont know how my professor supposes we would have the time to solve anything larger than a 3x3
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help-10
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martiniman31
03/22/2022 20:15:49
awe man
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martiniman31
03/22/2022 20:16:13
I just posted the to chegg as well so we will see I guess
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Alfie
03/22/2022 20:16:27
Hardest I have had to ever do is invert a 3x3 with some algebraic constants, sorry I can't help more. Someone here can probably help, if they can be asked to work that out haha
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martiniman31
03/22/2022 20:16:56
If you know of anyone who might know something any help would be appreciated lol
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Alfie
03/22/2022 20:17:01
Though a quick google tells me det(B^T) is det(B)
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Remavas
03/22/2022 20:17:13
And if I remember my linear algebra right'
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help-10
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Remavas
03/22/2022 20:17:28
$\det(A^{-1}) = \frac{1}{\det(A)}$
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help-10
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TeXit
03/22/2022 20:17:38
**Remavas**
https://cdn.discordapp.c…980977336321.png
373884980977336321.png
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Alfie
03/22/2022 20:17:44
This is correct, I do remember this
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martiniman31
03/22/2022 20:17:51
yup that rings a bell
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Remavas
03/22/2022 20:18:21
And you can also use the row multiplication property of the determinant
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help-10
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Remavas
03/22/2022 20:18:32
and that should do it
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help-10
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Alfie
03/22/2022 20:18:41
Another google search is telling me: If we multiply a scalar to a square matrix A , then the value of the determinant will change by a factor scalar^(square size)!
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help-10
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Remavas
03/22/2022 20:18:52
Boring
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help-10
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Alfie
03/22/2022 20:18:54
Screenshot may be better
https://cdn.discordapp.c…5544/unknown.png
unknown.png
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Remavas
03/22/2022 20:19:01
You can derive that from the row multiplication property
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help-10
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Alfie
03/22/2022 20:19:11
🥱 deriving in an exam
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help-10
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Alfie
03/22/2022 20:19:13
Just got to hit the points
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help-10
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Remavas
03/22/2022 20:19:27
Math is a beautiful construct
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help-10
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Remavas
03/22/2022 20:19:32
Don't deny its beauty
0
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Alfie
03/22/2022 20:19:37
This is true
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help-10
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Alfie
03/22/2022 20:19:40
However, exams are not
0
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Remavas
03/22/2022 20:19:41
*says the physicist*
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help-10
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Alfie
03/22/2022 20:19:51
Hey, I'm starting my Computer Science degree in a few months 🤷‍♂️
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martiniman31
03/22/2022 20:20:05
lol thanks you guys mechanical engineering sure is no cake walk
1
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help-10
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Remavas
03/22/2022 20:20:11
sin x = x
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Remavas
03/22/2022 20:20:21
sure isn't
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Alfie
03/22/2022 20:20:25
e = pi = 3?
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Remavas
03/22/2022 20:20:28
STEM in general isn't
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Remavas
03/22/2022 20:20:33
pi^2 = g
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martiniman31
03/22/2022 20:20:33
always hahah!
1
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Alfie
03/22/2022 20:21:19
but yes to the first question: det(3A^-1B^T) = 3^4 * 5 * 1/10 = 81/2??
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Alfie
03/22/2022 20:21:35
Unless I am applying the quickly googled laws incorrectly 😔
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Remavas
03/22/2022 20:22:45
yes you are
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Alfie
03/22/2022 20:22:54
sad
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help-10
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Remavas
03/22/2022 20:23:05
B is transposed
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Remavas
03/22/2022 20:23:10
A is inverted
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Alfie
03/22/2022 20:23:17
ah .
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Alfie
03/22/2022 20:23:19
lol
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Alfie
03/22/2022 20:23:32
3^4 * 1/5 * 10
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Remavas
03/22/2022 20:23:45
See, google won't help you!
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Remavas
03/22/2022 20:23:52
Better learn to apply the laws
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Alfie
03/22/2022 20:23:54
Reading the question properly might
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Alfie
03/22/2022 20:23:58
And yes - had better. lol
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Alfie
03/22/2022 20:27:44
For part 5, some (more intensive) googling tells me that the determinant of C is equal to det(A)^2
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martiniman31
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Alfie
03/22/2022 20:28:00
so sqrt(128)?
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Alfie
03/22/2022 20:28:21
@martiniman31 unsure if you have answers, but would love to hear if this is correct
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moanco
03/22/2022 20:53:07
ghi
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moanco
03/22/2022 20:53:08
hi
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moanco
03/22/2022 20:53:13
@Helpers
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moanco
03/22/2022 20:53:15
'can i get help
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moanco
03/22/2022 20:53:21
im just lost
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moanco
03/22/2022 20:53:42
https://cdn.discordapp.c…7388/unknown.png
unknown.png
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Alfie
03/22/2022 20:54:38
Do you know what a local minimum is?
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Alfie
03/22/2022 20:54:46
It's pretty self explanatory, but just to check @moanco
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moanco
03/22/2022 21:04:15
noo
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moanco
03/22/2022 21:04:22
is it just the lowest poit
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moanco
03/22/2022 21:04:24
of the graph
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moanco
03/22/2022 21:07:08
@Helpers
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moanco
03/22/2022 21:07:11
@Alfie
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Alfie
03/22/2022 21:07:30
It's a turning point which is lower than both sides of it
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Alfie
03/22/2022 21:07:45
(which would be where the second derivative is greater than 0, showing that the rate of change is increasing)
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Alfie
03/22/2022 21:07:56
essentially a valley. the point of the valley (where dy/dx = 0)
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Alfie
03/22/2022 21:08:02
So you can just read them from the graph pretty nicely there
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moanco
03/22/2022 21:11:47
so is the naswer -4?
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martiniman31
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false
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moanco
03/22/2022 21:11:48
answer
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Alfie
03/22/2022 21:13:28
That's a local maximum
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moanco
03/22/2022 21:14:49
is it -7
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moanco
03/22/2022 21:18:57
@Helpers
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