### Home > CC3 > Chapter 2 > Lesson 2.1.2 > Problem2-19

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 x2 when x = −2 results in the solution (−2)2 = 4.

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

1. −4d + 3 if d = −1

Substitute −1 for d.

−4(−1) + 3

Simplify the terms and combine them.

4 + 3 = 7

7

1. km if k = 4 and m = −10

Follow the steps in part (a).

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

(4) − (−10)

1. $\frac{t}{w}$ if t = 6 and w = −3

Follow the steps in part (a).

−2

1. x2 + y2 if x = 7 and y = 5

Follow the steps in part (a).