What is the domain restriction for f(x)=x+1x2−x−20f(x) = \frac{x+1}{x^2-x-20}f(x)=x2−x−20x+1?
x≠4,−5x \neq 4, -5x=4,−5
x≠5,−4x \neq 5, -4x=5,−4
x≠−1x \neq -1x=−1
x≠0x \neq 0x=0