Simplify dfracx2−20x−4\\dfrac{x^2 - 20}{x - 4}dfracx2−20x−4 for xneq4x \\neq 4xneq4
x−5x - 5x−5
x+5x + 5x+5
x+4x + 4x+4
x−4x - 4x−4