Answer
$\dfrac{3\sqrt{x}}{x}$
Work Step by Step
Using the properties of radicals, the given expression, $
\dfrac{3}{\sqrt{x}}
,$ simplifies to
\begin{array}{l}\require{cancel}
\dfrac{3}{\sqrt{x}}\cdot\dfrac{\sqrt{x}}{\sqrt{x}}
\\\\=
\dfrac{3\sqrt{x}}{x}
.\end{array}
Note that all variables are assumed to represent positive real numbers.