0
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-9 squared = 81
(-9)^2 = (-9) * (-9) = 81
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81
9
(-3)2 = 9
-9
(-1/3)2 = 1/9
-2*(-2)2 + 0*(-2) + 9 = -2*4 + 9 = -8 + 9 = 1