Answer
$\frac{\sqrt{2}}{3}$
Work Step by Step
The given expression is
$=\sqrt{\frac{18}{81}}$
Factor as square term.
$=\sqrt{\frac{9\cdot 2}{9\cdot 9}}$
Cancel common terms.
$=\sqrt{\frac{2}{9}}$
Use quotient property of square roots.
$=\frac{\sqrt{2}}{\sqrt{9}}$
Simplify.
$=\frac{\sqrt{2}}{3}$
