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NationalTutoringObservatory
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MathEd-PII

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8
volunteer
Well, what number
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1,613
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student
3
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volunteer
but it's still equal to 0 at 3, right? So we'd include 3.
16,453
1,615
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student
Oh, it's equal to.
16,453
1,616
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volunteer
Yeah, cause it's less than or equal to 0, right?
16,453
1,617
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student
Yeah
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1,618
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volunteer
So it's equal to 0 at 3, right? Because it's a route.
16,453
1,619
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student
Yeah
16,453
1,620
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student
Yeah
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volunteer
So the ending point would be 3 in a bracket. Do you know what we put? cause every number before 3 is negative, right? So that'd be less than 0.
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student
I you know 43 is less than 0.
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volunteer
huh?
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student
You said every number before 3 is less than 0.
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volunteer
No
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volunteer
Uh.
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student
Yeah.
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1,628
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volunteer
Yes, because if we plug in every number before 3, it's negative, right? We see that on the chart.
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1,629
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student
Yes
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volunteer
And so, what would it be if every number before 3 is equal to before is equal, is less than zero.
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student
Um, is it bracket
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volunteer
is negative infinity, right?
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volunteer
And see, actually we would put negative infinity in a parenthesis because we cannot technically reach negative infinity.
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1,634
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student
I get.
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volunteer
or sorry, in a parenthesis. So it'd be parentheses and then brackets.
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student
So every time we start with negative infinity, it always has to be a parenthesis.
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volunteer
Yes, if it's going towards an infinity, it's a parentheses because we cannot technically reach infinity.
16,453
1,638
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student
OK
16,453
1,639
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student
And then this would be
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1,640
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student
is it the bracket
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volunteer
And but then it would be a closed bracket, yeah, because at 3 it's still equal to 0.
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1,642
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student
3, it's still equals to 0, right?
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volunteer
Yep. So that means we include it.
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1,644
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student
So when will it be both, when will it be both parenthesis.
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volunteer
Um, if it's negative infinity to infinity.
16,453
1,646
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student
Um
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volunteer
or if it said it was just less than 0?
16,453
1,648
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student
OK
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1,649
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volunteer
Like if it said it was just less than 0, it wouldn't equal 0 at 3, or it would equal 0 at 3, which wouldn't be less than 0, so it would be a parentheses there.
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volunteer
But because it includes the number 3
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volunteer
it would be a closed bracket.
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1,652
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volunteer
Does that make sense
16,453
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student
Yeah
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1,654
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volunteer
All right
16,453
1,655
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volunteer
How much more do we have
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volunteer
We got a lot, man.
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student
Mhm.
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1,658
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volunteer
All right
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1,659
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volunteer
You're doing well so far.
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volunteer
So plot the roots
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student
It should be 1
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volunteer
Uh-huh
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student
to get
16,453
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student
what
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volunteer
Good
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volunteer
Then make a sign chart. I'm going to leave this up to you.
16,453
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student
but.
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student
uh
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volunteer
Just making sure you're still there
16,453
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volunteer
All right, just making sure. I believe you got this.
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volunteer
Cause you gotta be able to do it on yourself on the test tomorrow.
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student
3
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volunteer
I also, your mic's cutting out so I can't hear you that well.
16,453
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student
Can you hear me now
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volunteer
A little bit, still cutting out a bit.
16,453
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student
Can you, can you hear me now
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volunteer
Yes, much better
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1,678
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volunteer
All right, so what would you do next
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1,679
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student
OK, so
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student
um
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student
0
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1,682
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student
times 4 is 0.
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1,683
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student
Those never full. So negative.
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1,684
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student
0, so negative.
16,453
1,685
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student
She sounds for.
16,453
1,686
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student
positive
16,453
1,687
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student
Yay
16,453
1,688
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student
OK. Solutions that
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1,689
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student
uh
16,453
1,690
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student
OK, this
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volunteer
Are you sure that last trip would be positive.
16,453
1,692
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student
Yeah
16,453
1,693
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student
right.
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1,694
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volunteer
Yup, you're right
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1,695
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student
Because
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1,696
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student
OK
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1,697
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student
Yeah
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volunteer
I'm just making sure, testing you.
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student
OK, well that I take into notation.
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volunteer
OK, I'm gonna, I think you can do this, but remember, look at the sign.
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volunteer
You see how it's not equal to zero.
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student
Oh yeah, negative infinity
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volunteer
So remember, it equals 0 at 5 and 1 or at -1 and 1. Do you know how to combine things together.
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volunteer
to combine two things together
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student
It equals your -1N1, right?
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volunteer
Oh, sorry, wait, it's looking for things greater than 0.
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1,707
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student
Oh, you're miserable
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1,708
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volunteer
right? And not greater than or equal to. So what would the lower number be?
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1,709
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student
Negative and
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1,710
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volunteer
No
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1,711
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volunteer
If looking for things greater than 0, right?
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