Question

Would my answer be: (-infiniti,-5) U (-5,4) U (4,infiniti) ?
to the problem: Find the domain of the following function and express in interval notation: f(x)=2x-10/x^2-x-20

Answer 1

denominator factors into (x - 5)(x + 4)
So your zeros are 5 and -4.....not -5 and 4

Answer 2

you have the right idea though. just use 5 and -4