Which condition is required for f(x)=x2−kx−3f(x) = \frac{x^2-k}{x-3}f(x)=x−3x2−k to have a hole at x=3x=3x=3?
k=3k=3k=3
k=9k=9k=9
k=6k=6k=6
k=0k=0k=0