Answer
$9\sqrt{3}$
Work Step by Step
Factor each radicand so that one of the factors is a perfect square to obtain:
$=\sqrt{25(3)} + \sqrt{16(3)}
\\=\sqrt{5^2(3)}+\sqrt{4^2(3)}$
Simplify each radical to obtain:
$=5\sqrt{3} + 4\sqrt{3}$
Combine like radicals to obtain:
$=(5+4)\sqrt{3}
\\=9\sqrt{3}$
