Answer
$\{ -4,0\}$
Work Step by Step
As an absolute value is greater or equal to zero and can not be negative, the only solution is $x^2+4x=0$ which gives $x=-4$ and $x=0$, thus the solution set is $\{ -4,0\}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 1 - Equations and Inequalities - Chapter 1 Test Prep - Review Exercises - Page 181: 121
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