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If the expression is (x - y)2, the solution is (7 - -2)2 = (7+2)2 = 92 = 81.

If the expression is x - y2, the solution is 7 - (-2)2 = 7 - 4 = 3.

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Q: What is the value of the expression x-y squared when x equals 7 and y equals negative 2?
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