Answer
$4\sqrt{2}$.
Work Step by Step
The given expression is
$=\sqrt{32}$
Factor as square terms.
$=\sqrt{16\cdot 2}$
Use product property of square roots.
$=\sqrt{16}\cdot \sqrt{2}$
Use $16=4^2$.
$=\sqrt{4^2}\cdot \sqrt{2}$
Simplify.
$=4\sqrt{2}$.
