Answer
$17$
Work Step by Step
RECALL:
For non-negative real numbers a,
$\sqrt{a^2}=a$.
Simplify each radical using the rule above to obtain
$\sqrt{12^2}+\sqrt{5^2}
\\=12+5
\\=17.$
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: 10
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