Answer
$2\sqrt 5$
Work Step by Step
Recall the following rule:
$(\sqrt{x^{2}})=x$
Thus, we obtain:
$\sqrt {20}=\sqrt {4\times5}=\sqrt {2^{2}}\times \sqrt 5=2\times\sqrt 5=2\sqrt 5$
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 Review Problem Set - Page 430: 7
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