find domain f(x) = 4x*x-6x+20 / x*x-11x-12

Question

f(x)=4x²-6x+20 / x²-11x-12

Answer 1

Since x= -1 and x= 12 are zeros of the denominator, the domain is real numbers except -1 and 12.

D{f}=(-∞, -1)∪(-1, 12)∪(12, +∞)