\begin{equation}\sqrt{4} \times \sqrt{4}\end{equation}

\begin{equation}\sqrt{9} \times \sqrt{81}\end{equation}

\begin{equation}\sqrt{49} \times \sqrt{63}\end{equation}

\begin{equation}\sqrt{175} \times \sqrt{6}\end{equation}

\begin{equation}\frac{\frac{\sqrt{10}}{5} \times \sqrt{7}}{9}\end{equation}

\begin{equation}(6-\sqrt{5}) \times (6+\sqrt{5})\end{equation}

\begin{equation}(5 \times \sqrt{9})^{2}\end{equation}

\begin{equation}\sqrt{(9x)}\sqrt{(9x+9)}\end{equation}

\begin{equation}\sqrt{(5x)}\sqrt{(80x^{3})}\end{equation}

\begin{equation}4\sqrt{(35x)}\sqrt{(20x)}\end{equation}

\begin{equation}10\sqrt{(3x)}\sqrt{(729x)}\end{equation}

\begin{equation}5\sqrt{(2x)}\sqrt{(18x)}\end{equation}