### 7.4: Integration by Substitution

Read Section 8.1 (pages 161-166). This section explains the process of taking the integral of slightly more complicated functions. We do so by implementing a "change of variables," or rewriting a complicated integral in terms of elementary functions that we already know how to integrate. Simply speaking, integration by substitution is merely the act of taking the chain rule in reverse.

Watch this video from 30:00 to the end.

Work through problems 5-19 for Exercise 8.1. When you are done, check your answers against Appendix A.