What is the domain of f(x)=x+4x2−2x−8f(x) = \dfrac{x + 4}{x^2 - 2x - 8}f(x)=x2−2x−8x+4?
All reals except x=4x = 4x=4 and x=−2x = -2x=−2
All reals except x=−4x = -4x=−4
All reals except x=4x = 4x=4
All reals