This problem is a checkpoint for multiplying binomials and solving equations with parentheses. It will be referred to as Checkpoint 6B.

In parts (a) and (b) rewrite the expression without parentheses, and in parts (c) and (d) solve each equation.

Check your answers by referring to the Checkpoint 6B materials located at the back of your book.

Ideally, at this point you are comfortable working with these types of problems and can solve them correctly. If you feel that you need more confidence when solving these types of problems, then review the Checkpoint 6B materials and try the practice problems provided. From this point on, you will be expected to do problems like these correctly and with confidence.