If you have an even power the sign of the number does not matter.
(-x)4 * (-x)2 = x4*x2 = x6
Not a great deal. Multiply it by itself and divide by 4. If x is imaginary, x2 is negative.
Negative 9 to the negative 2nd power (-9-2) = 0.012345679 (repeating).
0.000244140625
5 over 8 to the negative 2nd power equals 2.56
6 to the negative 2nd means that it equals 1 over 6 to the negative 2nd.
Five halves to the negative 2nd power is 0.16
-3 to the 2nd power is -3 x -3 = +9 ( negative x negative = positive)
Multiply the number by itself.
1 over 3 to the negative 2nd power is 9
16
1/16
2-2 = 4