Simplify: x2−4xx2−16\dfrac{x^2 - 4x}{x^2 - 16}x2−16x2−4x (assume x≠±4x \neq \pm 4x=±4).
xx+4\dfrac{x}{x + 4}x+4x
x−4x+4\dfrac{x - 4}{x + 4}x+4x−4
xx−4\dfrac{x}{x - 4}x−4x
4x+4\dfrac{4}{x + 4}x+44