How to do a exponent with the negative base?

Examples :
(-2)^3 = (-2)(-2)(-2) = - 8

(-3)^4 = (-3)(-3)(-3)(-3) = 81

(-1)^5 = (-1)(-1)(-1)(-1)(-1) = -1

** if the exponent is an even number, the answer will be positive. if the exponent is an odd number, then the answer will be negative

** but keep in mindif the negative is not included with the base..
-(5^2) = - 25but (-5^2) = 25

25% increaseplus i think decrease i only know increase: ((