1. The problem is to simplify the expression $$3\sqrt{6} - 6$$. 2. Recall that $$\sqrt{a}$$ means the square root of $$a$$, and it cannot be simplified further unless $$a$$ is a perfect square or can be factored into a perfect square. 3. Here, $$3\sqrt{6}$$ means $$3 \times \sqrt{6}$$, and $$6$$ is a constant. 4. Since $$\sqrt{6}$$ cannot be simplified further (6 is not a perfect square), and 6 is a constant, the expression cannot be combined into a simpler radical form. 5. Therefore, the simplified form of the expression is simply $$3\sqrt{6} - 6$$. Final answer: $$3\sqrt{6} - 6$$.