### Home > CCAA > Chapter 2 Unit 4 > Lesson CC3: 2.1.2 > Problem 2-19

2-19.

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

*results in the solution*

Evaluate the expressions below for the given values.

if Substitute

for .Simplify the terms and combine them.

ifandFollow the steps in part (a).

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

ifandFollow the steps in part (a).

^{ }ifandFollow the steps in part (a).