Since $\frac{32}{16}$ and $\frac{49}{16}$ have the same denominator, add them by adding their numerators.
$$4\sqrt{\frac{32+49}{16}}$$
Add $32$ and $49$ to get $81$.
$$4\sqrt{\frac{81}{16}}$$
Rewrite the square root of the division $\frac{81}{16}$ as the division of square roots $\frac{\sqrt{81}}{\sqrt{16}}$. Take the square root of both numerator and denominator.
