Answer
$$2\sqrt{30x}$$
Work Step by Step
RECALL:
(1) For any real numbers $a \ge 0, b\ge0$, $\sqrt{ab}=\sqrt{a} \cdot \sqrt{b}$
(2) For any real numbers $a \ge 0, b\gt 0$, $\sqrt{\dfrac{a}{b}}=\dfrac{\sqrt{a}}{\sqrt{b}}$
Use rule (1) above to obtain:
\begin{align*}
&=\sqrt{4(30x)}\\
&=\sqrt{4} \cdot \sqrt{30x}\\
&=2\sqrt{30x}
\end{align*}
