### Home > AC > Chapter 2 > Lesson 2.1.9 > Problem 2-90

2-90.

Evaluate the expressions below for the given values.

Substitute the given values for the variables

and.

Simplify the expression.

Substitute

in the expression. Then simplify.

After substituting

, the expression becomes: Simplify. Be sure to multiply the

and before squaring!

Replace each

, and then simplify the expression.