I did mean the cube root, I'm sorry. I was talking on the phone to my friend about a different problem, ironically, so I messed up. so there's no +/-, it's only plus?
Case 1:
If n is even and a>0, then there are two roots:
Case 2:
If n is odd, then there is one root, and it depends on whether a is positive or negative. If b is positive, then . Otherwise, if b is negative, then