### Home > CC3 > Chapter 2 > Lesson 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 *x*^{2} when *x* = −2 results in the solution (−2)^{2} = 4.

Evaluate the expressions below for the given values. Homework Help ✎

−4

*d*+ 3 if*d*= −1Substitute −1 for

*d*.−4(−1) + 3

Simplify the terms and combine them.

4 + 3 = 7

7

*k*−*m*if*k*= 4 and*m*= −10Follow the steps in part (a).

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

(4) − (−10)

if*t*= 6 and*w*= −3Follow the steps in part (a).

−2

*x*^{2}+*y*^{2 }if*x*= 7 and*y*= 5Follow the steps in part (a).