79, -79
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78 minus78
The answer? There is no "answer" There cannot be an answer because they are all different. In order to make calculations, the variables have to be the same. x squared, xy, y squared are the variables, and none of them match. Therefore your "answer" must look like this: 9x squared - 6xy + y squared - 81. Hope I Helped :D
(2x - 9)(2x - 9) or (2x - 9)2
81 x 2 - 16 = 146
(9 - 5u)(9 + 5u)