#### 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, $\sqrt (12^{2})=|12|=12$.

Published by
Pearson

ISBN 10:
0321969359

ISBN 13:
978-0-32196-935-4

12

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