Question

Find the square root of 1764

Answer 1

$1764=2\times 2\times 3\times 3\times 7\times 7$

Taking out one factor from every pair,

$=\sqrt{1764}=\sqrt{2\times 2\times 3\times 3\times 7\times 7}$

$=2\times 3\times 7=42$