#### Answer

No solution

#### Work Step by Step

Recall, in order to cancel out a square root, we square both sides of the equation. Thus, we square both sides of the equation to obtain that 3x=36. We divide both sides of the equation by 3 to isolate x and obtain: x=12.
We now must check our solution:
$\sqrt{3 \times 12} = -6 \\\\\ \sqrt {36}=-6 \\\\ 6 = -6$
This is not true, so there is no solution.