Question:
Simplify the expression $\sqrt{7!}$, where $n!$ stands for $n\cdot(n-1)\cdot(n-2)\cdots \cdot 2\cdot 1$.

Answer:
We expand $7!$: $$\sqrt{7\cdot6\cdot5\cdot4\cdot3\cdot2\cdot1}$$Factoring out the $4$ and the $6\cdot3\cdot2=36$ gives $$\boxed{12\sqrt{35}}.$$This can't be simplified any more because 35 has no square factors.