Answer
Not correct
Work Step by Step
No. Her solution is not correct.
Mistake is when taking square root, it should be $|x|\leq12$ instead of $x\leq12$.
So, the answer becomes:
$$x\in[-12,12]$$
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter 1 - Section 1.7 - Inequalities - 1.7 Exercises - Page 149: 100
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