Simplify: x2−16x2−4x\frac{x^2 - 16}{x^2 - 4x}x2−4xx2−16
x−4x\frac{x-4}{x}xx−4
4x\frac{4}{x}x4
x+4x+4x+4
x+4x\frac{x+4}{x}xx+4