Answer
$13$
Work Step by Step
RECALL:
For negative real numbers $a$,
$\sqrt{a^2}=|a|$.
Use the rule above, where $a=-13$ to obtain
$\sqrt{(-13)^2}=|-13| = 13$.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.3 - Radicals and Rational Exponents - Exercise Set - Page 45: 11
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