1 everything to the power of 0 = 1
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0 minus -9 is 9
0
9 to negative 2 = 1/9 to plus 2 = 1/81
-3^2 = 9 -(3^2) = -9
-3 0 = - 1 = Always a form of 1 and in the first instance you are taking 3 to the 0 power then applying the negative sign.