#### Answer

The statement given is false.
A true statement would be:
$\sqrt{-4}\cdot\sqrt{-9}=6$

#### Work Step by Step

$\sqrt{-4}\cdot\sqrt{-9}=-6$
Evaluate the product on the left side and simplify:
$\sqrt{(-4)(-9)}=-6$
$\sqrt{36}=-6$
$6\ne-6$ False
A true statement would be:
$\sqrt{-4}\cdot\sqrt{-9}=6$