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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

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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