Question

Question 11
$\sqrt{10}\times \sqrt{15}$ is equal to

A) $6\sqrt{5}$
B) $5\sqrt{6}$
C) $\sqrt{25}$
D) $10\sqrt{5}$

Answer 1

The answer is B.
$\sqrt{10}\times \sqrt{15}=\sqrt{2.5}\times \sqrt{3.5}=\sqrt{2}\times \sqrt{5}\times \sqrt{3}\times \sqrt{5}$
$=(\sqrt{2}\times \sqrt{3})(\sqrt{5}\times \sqrt{5})=\sqrt{6}\times 5=5\sqrt{6}$