# How do you simplify 4sqrt18-2sqrt8?

$\sqrt{18} = \sqrt{{3}^{2} \cdot 2}$
$\sqrt{8} = \sqrt{{2}^{2} \cdot 2}$
$4 \sqrt{18} - 2 \sqrt{8}$
$= 4 \left(3\right) \sqrt{2} - 2 \left(2\right) \sqrt{2}$
$= 8 \sqrt{2}$