This is my last question...I know this is a non-linear ineqy=uality right? So what do I do in this case?

What is the domain of g(x) = x^3-2x - 1

The domain of a function is the set of possible values of the function's independent variable, which in this case is x.

Do you see any reason that x cannot be any number from - to + infinity?

I don't