Answer
$\dfrac{\sqrt{6x}}{10}$
Work Step by Step
Rationalizing the denominator of $
\sqrt[]{\dfrac{3x}{50}}
$ results to
\begin{array}{l}
\sqrt[]{\dfrac{3x}{50}}
\cdot
\sqrt[]{\dfrac{2}{2}}
\\\\=
\sqrt[]{\dfrac{6x}{100}}
\\\\=
\dfrac{\sqrt{6x}}{10}
.\end{array}