Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Practice and Problem-Solving Exercises - Page 34: 31



Work Step by Step

To subtract a number, add its opposite number. $-13-7=-13+(-7)$ To add negative numbers, add their absolute values and make the result negative. $-13+(-7)=-(|-13|+|-7|)=-(13+7)=-20$
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