#### Answer

$15\sqrt{3}-9\sqrt{2}$

#### Work Step by Step

Simplify the radicals that can still be simplified by factoring the radicand so that one of the factors is a perfect square:
$=5\sqrt{9(3)}-3\sqrt{9(2)}
\\=5\sqrt{3^2(3)} -3\sqrt{3^2(2)}
\\=5\cdot 3\sqrt{3} -3\cdot 3\sqrt{2}
\\=15\sqrt{3}-9\sqrt{2}$