Answer
$\frac{\sqrt{14}}{7}$.
Work Step by Step
The given expression is
$=\sqrt{\frac{2}{7}}$
Use quotient rule.
$=\frac{\sqrt{2}}{\sqrt{7}}$
Multiply the numerator and the denominator by $\sqrt 7$.
$=\frac{\sqrt2}{\sqrt7}\cdot \frac{\sqrt{7}}{\sqrt7}$
Use product rule.
$=\frac{\sqrt{14}}{7}$.
