Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 3 - Solving Inequalities - 3-7 Absolute Value Equations and Inequalities - Practice and Problem-Solving Exercises - Page 211: 14

Answer

d=−4 or d=4
1526064996

Work Step by Step

We know that when we evaluate an absolute value, the result will be positive, regardless of the sign of what is inside of the absolute value bars. Thus, we consider that the variable could be either a positive or a negative number. 5|d|=20⟶ divide each side by 5 5|d|÷5=20÷5⟶ divide |d|=4⟶ definition of absolute value d=−4 or d=4 Check each answer. 5|−4|=5×4=20✓ 5|4|=5×4=20✓
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