what is the domain for f(x)= 1 / (x^3-4x)?

Thanks!

Factorize the denominator to get

f(x)=1/(x(x-2)(x+2))
Realizing that the domain of a rational function is ℝ minus the values of x which makes the denominator zero.

In this case, the domain of f(x) is ℝ less three points. Can you spot them?