Why have you encountered this equation? Perhaps it is only a thought / property question. Rephrase in words and think about it.

What number is alterered identically by a power and a root.

The square is the square root.

The cube is the cube root.

There are not too many candidates.

Does it make a difference if x is positive or negative?

Does it make a difference if n is odd or even?

Again, why have you encountered this equation?