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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 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. 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).