So,
We want to find the domain of the function:
[tex]f(x)=4x^{-3}[/tex]We could rewrite this function as:
[tex]f(x)=\frac{4}{x^3}[/tex]Remember that the domain of a function f(x) is defined as all the values that the variable "x" could take.
In this case, notice that if x=0, the function f is not defined. But, "x" can take any other value.
So, the domain is:
[tex]D_f=R-\mleft\lbrace0\mright\rbrace[/tex]That's all the real numbers less zero.
This can be written in interval notation as:
[tex]D_f=(-\infty,0)U(0,\infty)[/tex]