Question

What is the domain of `(2x^2+x-1)/(x^3-9x)`?

Answer 1

The domain is all the real values except those who nullify `x^3-9x`

So we have `x^3-9x=0=>x(x^2-9)=0=>x=0,x=3,x=-3`

So the domain is `R-{0,-3,3}` where R is the set of real numbers