Cool math Algebra Help Lessons: Factoring Polynomials - Trinomials

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Coolmath Algebra
Factoring Lesson 4 - Trinomials - Undoing FOIL (page 6 of 9)
---- This algebra lesson explains how to undo FOIL in trinomials.

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TRY IT:

Factor

Here's a harder one:

Factor

We start with

Our last term is 10... so, our choices are

Which is it? Our middle guy will guide us...

We need a 7.

Can we use a 1 and a 10 to make a 7? No!

So it's the 2 and the 5:

What about the signs?

So,

Continued on the next page

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