Find the value of kkk such that the function f(x)=x2−4x2−kx+2f(x) = \frac{x^2 - 4}{x^2 - kx + 2}f(x)=x2−kx+2x2−4 has a vertical asymptote at x=1x=1x=1.
k=3k=3k=3
k=1k=1k=1
k=−3k=-3k=−3
k=0k=0k=0