You may want to review fractional exponents first.
You can also rewrite a fractional exponent with a root. (This is helpful if you need to explain your answer to someone who doesn't understand about fractional exponents.) For example, suppose you have (−x + y − 2)−1 ⁄ 5. The numerator of the exponent is −1 and the denominator is 5, so you rewrite it as 5√((−x + y − 2)−1).
Of course, if the numerator is 1, you don't need to write it in the final answer. For example, if you had (−x + y − 2)1 ⁄ 5, you would rewrite it as 5√(−x + y − 2).
Again, for these problems, you don't need to do any other simplifications; we're just practicing going between roots and fractional exponents.