#### Answer

13

#### 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, $\sqrt (-13)^{2}=|-13|=13$.

Published by
Pearson

ISBN 10:
0321969359

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

13

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