Cool math Algebra Help Lessons: Factoring Polynomials - Trinomials

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

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TRY IT:

Factor

Now, I'll take a crutch away...

Let's factor

I'll give you

( x 2 ) ( x ) ... we need the second number and the signs

What goes in here?

( 2 ) ( ? ) = 12 ... the unknown is 6, therefore we can now write ( x 2 ) ( x 6 )

What about the signs?

The last term is -12.

The middle coefficient is -4.

Since the last term is negative, we need a + and a -

Which is it?

Continued on the next page

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