# How do you simplify 4sqrt32 - 5sqrt20?

$= 16 \sqrt{2} - 10 \sqrt{5}$
$4 \left(\sqrt{4} \sqrt{8}\right) - 5 \left(\sqrt{4} \sqrt{5}\right)$
$8 \sqrt{4} \sqrt{2} - 10 \sqrt{5}$
$= 16 \sqrt{2} - 10 \sqrt{5}$