Cool math Algebra Help Lessons: Factoring Polynomials - Trinomials

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Coolmath Algebra
Factoring Lesson 4 - Trinomials - Undoing FOIL (page 5 of 9)
---- This algebra lesson explains how to undo FOIL in trinomials.

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( -2 ) ( 6 ) = -12 and -2 + 6 = 4 or ( 2 ) ( -6 ) = -12 and +2 - 6 = -4 ...the second option is correct

So,

YOUR TURN:

Factor
Factor

Now, let's work from scratch!

Factor

We start with

Our last term is 5... our only choice is

The 5 has to be positive...

( -1 ) ( -5 ) = 5 or ( 1 ) ( 5 ) = 5 ... the middle guy is -6 ... -1 - 5 = -6 ... therefore, it is the first option

So,

That one was pretty easy since 5 is prime.

Continued on the next page

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