Answer
$3\sqrt 5$
Work Step by Step
Recall the following rule: $\sqrt{x^{2}}=x$. Thus, we obtain:
$\sqrt {45}=\sqrt {9\times5}=\sqrt {3^{2}}\times\sqrt 5=3\times\sqrt 5=3\sqrt 5$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 9 - Roots and Radicals - Chapter 9 Test - Page 431: 6
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