Answer
$\dfrac{\sqrt{21}}{3}$
Work Step by Step
Rationalize the denominator by multiplying $\sqrt{3}$ to both the numerator and the denominator to obtain:
$=\dfrac{\sqrt{7} \cdot \sqrt{3} }{\sqrt{3} \cdot \sqrt{3}}
\\=\dfrac{\sqrt{7(3)}}{3}
\\=\dfrac{\sqrt{21}}{3}$
