What is the domain of f(x)=x+2x2−16f(x) = \frac{x+2}{x^2 - 16}f(x)=x2−16x+2?
All real numbers except x=2x = 2x=2
All real numbers except x=16x = 16x=16
All real numbers except x=4,−4x = 4, -4x=4,−4
All real numbers except x=4x = 4x=4