### Home > CCA > Chapter A > Lesson A.1.2 > Problem A-18

A-18.

Remember that one meaning of the word “evaluate” is to replace a variable with a number and to calculate the result. For example, evaluating the expression when

*gives the solution*

Evaluate the expressions below for the given values.

Substitute

for .Simplify the terms and combine them.

Follow the steps in part (a).

Put everything you substituted inside parentheses so you do not lose your negative signs.

Follow the steps in part (a).

Follow the steps in part (a).