# What is the square root of the fraction 81 over 144?

$\frac{3}{4} = 0.75$
$\sqrt{\frac{81}{144}} = \frac{\sqrt{81}}{\sqrt{144}} = \frac{9}{12} = \frac{3}{4} = 0.75$
$\sqrt{a + b} \ne \sqrt{a} + \sqrt{b}$