Question

Solve: $3\times \sqrt{8}\times 3\times \sqrt{2}$

Answer 1

We have

$3\times \sqrt{8}\times 3\times \sqrt{2}$

$=3\times 2\sqrt{2}\times 3\times \sqrt{2}$ [ $\because \sqrt{8}=2\sqrt{2}$ ]

$=3\times 3\times 2\times \sqrt{2}\times \sqrt{2}$

$=9\times 2\times 2$ [ $\because \sqrt{2}\times \sqrt{2}=2$ ]

$=18\times 2$

$=36$