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SAT Math: Factoring a Quadratic Equation 1 Views
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Description:
For the quadratic equation above, if x is a root that is less than 0, what is the value of x + 3?
Transcript
- 00:00
Yeah Whoa Okay I say team mash members Another quadratic
- 00:06
e thing foryou X squared equals nine Next plus fifty
- 00:09
two for the quadratic equation above effects is a route
- 00:12
that is less than zero What's the value of X
- 00:14
plus three Interesting All right well all we really need
Full Transcript
- 00:19
to solve this problem is to numbers the issues actually
- 00:22
tracking them down Like where do we find him First
- 00:25
when working with quadratic equations we gotta be sure to
- 00:27
set one side equal to zero So let's do that
- 00:29
We've got X squared minus nine X minus fifty to
- 00:31
zero Right now we're going to find the two numbers
- 00:33
that add up to be which is the middle term
- 00:36
there that minus nine thing And that also multiplied to
- 00:39
see the intern there that fifty two So our mystery
- 00:42
Numbers are 1 of the negative thirteen and positive for
- 00:47
that gets us there Yeah Okay So then we factory
- 00:50
like this explains thirteen times X plus four equals zero
- 00:54
So axes either thirteen or negative for an ex can
- 00:57
be either of these two values But the problems said
- 00:59
less than zero So we don't read the novel We
- 01:03
just choose negative for to be our value of X
- 01:06
But hold on Negative for is not the answer We
- 01:09
need to find X plus three or negative four plus
- 01:13
three which is negative one See that was a tricky
- 01:16
curveball They threw it just Yeah well watch out for 00:01:19.22 --> [endTime] those
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