Question

Evaluate:$\sqrt{99}\times \sqrt{396}$

Answer 1

We have,

$\sqrt{99}\times \sqrt{396}$

$=\sqrt{11\times 9}\times \sqrt{11\times 36}$

$=3\sqrt{11}\times 6\sqrt{11}$

$=18\sqrt{11\times 11}$

$=18\times 11$

$=198$

Hence, this is the answer.