Simplify m^(5/2) square root of 324

$m^{\frac{5}{2}} \sqrt{324}$

Rewrite $324$ as $18^{2}$ .

$m^{\frac{5}{2}} \sqrt{18^{2}}$

Pull terms out from under the radical, assuming positive real numbers.

$m^{\frac{5}{2}} \cdot 18$

Move $18$ to the left of $m^{\frac{5}{2}}$ .

$18 m^{\frac{5}{2}}$