#### Answer

$-3-i\sqrt{2}$

#### Work Step by Step

Original Problem:
$\frac{-9-\sqrt{-18}}{3}$
Factor out $\sqrt{-1}$.
$\frac{-9-\sqrt{-1}\times\sqrt{18}}{3}$
Factor out 3. Know that $\sqrt{-1}=i$.
$\frac{-9-3i\sqrt{2}}{3}$
Divide each numerator term by 3.
$-3-i\sqrt{2}$