Simplify 1−4k21−2k\frac{1 - \frac{4}{k^2}}{1 - \frac{2}{k}}1−k21−k24.
k−2k\frac{k-2}{k}kk−2
k+2k\frac{k+2}{k}kk+2
k+4k\frac{k+4}{k}kk+4
k−4k\frac{k-4}{k}kk−4