### Home > CCA2 > Chapter 3 > Lesson 3.2.5 > Problem 3-126

3-126.

Factor each expression completely.

This is a difference of two squares.

If you don't know the pattern for difference of two squares yet, use a generic rectangle to help you.

is a common factor. Factor it out. What is left is a difference of two squares, as in part (a). Factor again.

You can use an area model.

The common factor is

.After you factor out

you have to factor a second time.