(x+3)2 - x2 + 6x+ 9, (x-3)2 - x2 - 6x + 9, x2 - 9 - (x+3) (x-3), (2x-5)2 - 4x2 - 20x + 25, (5x+2)2 - 25x2 + 20x + 4, 25x2 - 4 - (5x+2)(5x-2), (-2x+1)2 - 4x2 - 4x + 1, (1+2x)2 - 4x2 + 4x +1, (x - 4)2 - x2 - 8x + 16, (- x + 1)2 - x2 - 2x + 1,

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