### Home > CAAC > Chapter 7 > Lesson 7.2.3 > Problem 7-77

7-77.

Distribute to remove the parenthesis.

15*x*^{2} − 12*x* − 15*x*^{2}

Add like terms.

12*x*

Follow the steps outlined in part (a).

Start with a generic rectangle to simplify, then use the same method as part (a).

*x*^{2} − 3

Use the strategy shown in part (a) to solve this problem.