### Home > PC3 > Chapter 5 > Lesson 5.2.3 > Problem 5-87

5-87.

Let . Evaluate each of the following expressions, or state “impossible” and explain why. It may be helpful to first replace

*and*

*with their definitions.*

This means you need to solve

.

5-87.

Let . Evaluate each of the following expressions, or state “impossible” and explain why. It may be helpful to first replace

This means you need to solve

.