#### Answer

$10\sqrt 2$

#### Work Step by Step

Recall the following rule:
$(\sqrt{x^{2}})=x$
Thus, we obtain:
$5\sqrt 8=5\sqrt {4\times2}=5(\sqrt {2^{2}}\times\sqrt 2)=5(2\times\sqrt 2)=10\sqrt 2$

Published by
Cengage Learning

ISBN 10:
1285194055

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

$10\sqrt 2$

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