# How do you simplify the expression 2sqrt45-6sqrt5?

$= 0$
$2 \sqrt{45} - 6 \sqrt{5}$
$= 2 \sqrt{\left(9\right) \left(5\right)} - 6 \sqrt{5}$
$= 2 \left(3\right) \sqrt{5} - 6 \sqrt{5}$
$= 6 \sqrt{5} - 6 \sqrt{5}$
$= 0$