# How do you simplify 3sqrt18?

Mar 15, 2016

$9 \sqrt{2}$
Notice that: $18 = 2 \cdot {3}^{2}$
Therefore $3 \sqrt{18} = 3 \sqrt{2 \cdot {3}^{2}} = 3 \cdot 3 \sqrt{2}$
$= 9 \sqrt{2}$