#### Answer

$4\sqrt 5$

#### Work Step by Step

Recall the following rule:
$(\sqrt{x^{2}})=x$
Thus, we obtain:
$\sqrt {80}=\sqrt {16\times5}=\sqrt {4^{2}}\times\sqrt 5=4\times\sqrt 5=4\sqrt 5$

Published by
Cengage Learning

ISBN 10:
1285194055

ISBN 13:
978-1-28519-405-9

$4\sqrt 5$

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