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x2 +3x -2x-6 + x2+2x -3x -6 = 2x2 - 12
la segunda x2 - y2 (x2 + y2) = x4 + x2y2 - x2y2 - y4 = x4 - y4
la ultima es x2 + 2xy +y2 + x2 -2xy +y2 -2x2 + 2y2 = 2x2 + 2y2 - 2x2 + 2y2 = 4y2
espero que te sirva JPRG