#### Answer

$\sqrt{10}$

#### Work Step by Step

RECALL:
For any nonnegative real numbers $a$ and $b$,
$\sqrt{a} \cdot \sqrt{b} =\sqrt{ab}.$
Use the rule above to have
$\sqrt{2(5)}
\\=\sqrt{10}.$

Published by
Prentice Hall

ISBN 10:
0133186024

ISBN 13:
978-0-13318-602-4

$\sqrt{10}$

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