to get the negative exponent , you must have to take the reciprocal of the given making the number be the denominator of the fraction 1/X raise to any number, for example, 5^-2, so the solution will be, 1/5^2 or 1/25. in zero exponent, the answer will be always 1. cause in the rule., any number raise to zero exponent, the answer will be 1.
