# SAT Math: Factoring a Quadratic Equation

For the quadratic equation above, if x is a root that is less than 0, what is the value of x + 3?

Passport to Advanced Math | Radical and rational equations in one variable |

Product Type | SAT Math |

SAT | SAT Math |

SAT Math | Algebra and Functions Passport to Advanced Math |

Test Prep | SAT Math |

### Transcript

to solve this problem is to numbers the issues actually

tracking them down Like where do we find him First

when working with quadratic equations we gotta be sure to

set one side equal to zero So let's do that

We've got X squared minus nine X minus fifty to

zero Right now we're going to find the two numbers

that add up to be which is the middle term

there that minus nine thing And that also multiplied to

see the intern there that fifty two So our mystery

Numbers are 1 of the negative thirteen and positive for

that gets us there Yeah Okay So then we factory

like this explains thirteen times X plus four equals zero

So axes either thirteen or negative for an ex can

be either of these two values But the problems said

less than zero So we don't read the novel We

just choose negative for to be our value of X

But hold on Negative for is not the answer We

need to find X plus three or negative four plus

three which is negative one See that was a tricky

curveball They threw it just Yeah well watch out for 00:01:19.22 --> [endTime] those