### Home > AC > Chapter 16 > Lesson 16.9.1.4 > Problem 9-56

9-56.

Substitute 3 in for *x*.

You can do that because you do not have division by zero.

Do NOT substitute 2 in for '*x*' yet or you will have division by zero problem. Factor first, eliminating this problem. Then substitute 2 in for '*x*'.