x 2 - 4 - (x + 2)(x - 2), x 3 - 27 - (x-3)(x2 +3x+9), x 2 +6x-16 - (x + 8)(x -2), 25-x2  - (5-x )(5+x ), x 3 - 3x2 - x2 (x - 3),

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