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Factoring Polynomials Videos 14 videos

Factoring Trinomials of the Type ax^2 + bx +c
2329 Views

There are a variety of methods for factoring trinomials, Complete the square! Use the quadratic formula! Or be a genius and do it in your brain!

Factoring Polynomials
3383 Views

Factoring polynomials allows us to group things—and everything's always better in groups. Well... almost everything.

Factoring Polynomials by Grouping
10286 Views

Factoring polynomials by grouping is easy. You just combine like terms and then factor them out. Ta da!

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SAT Math 5.1 Algebra and Functions 198 Views


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Description:

SAT Math 5.1 Algebra and Functions

Language:
English Language

Transcript

00:02

And here's your shmoop du jour...

00:04

If 3x squared - 6 = 18, what does x squared - 2 equal?

00:10

And here are the possible answers...

00:14

Ok, so the key to this problem is figuring out how 3x squared - 6 = 18 relates

00:21

to x squared - 2.

00:24

And no, he's not her second cousin.

00:27

First, we see that both have an x squared in their equations...

00:31

so let's try solving for that.

00:33

Start with the first equation..

00:35

Add 6 to both sides... so 3x squared = 24.

00:40

Divide both sides by 3, and we have that x squared = 8.

00:45

Now, we can plug x squared = 8 into the second equation:

00:49

x squared - 2 = 8 - 2...which equals 6.

00:54

The answer is A.

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