Answer
12
Work Step by Step
For any real number $a$, $\sqrt (a^{2})=|a|$. That is, the principal square root of $a^{2}$ is the absolute value of $a$.
Therefore, $\sqrt (12^{2})=|12|=12$.
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
Published by
Pearson
ISBN 10:
0321969359
ISBN 13:
978-0-32196-935-4
Chapter 7 - Section 7.1 - Radical Expressions and Graphs - 7.1 Exercises - Page 440: 53
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