Question:
Factor $36-4x^2$ completely.

Answer:
We have $36-4x^2 = 6^2 - (2x)^2 = (6-2x)(6+2x)$.  We can factor a 2 out of each of $6-2x$ and $6+2x$ to give $2\cdot(3-x)\cdot 2\cdot(3+x) = \boxed{4(3-x)(3+x)}$. (We could also have factored out a 4 at the beginning: $36-4x^2 = 4(9-x^2)=4(3-x)(3+x)$.)