Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - Chapter 1 Review Problem Set: 4



Work Step by Step

RECALL: $a-b=a+(-b)$ Thus, $-6-9=-6+(-9)$ The numbers being added have the same sign. Perform the following steps: (1) Add their absolute values. $|-6| + |-9| = 6+9 = 15$ (2) The sum will have the same sign as the original numbers. Thus, $(-6)+(-9) = -15$
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