The question as stated could mean either (9/2)2 or 9/22. The first is 81/4 in lowest terms, while the second is 9/4 in lowest terms.
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-32 = -(32) = -9 (-3)2 = 9 The difference is 9 - (-9) = 18.
3-2 = 9
3² * 2 = 9 * 2 = 18 ■
(-2/3)^2 = 4/9
It then equals 1/81