4x2 + 12x + 9, (2x + 3)2, 9x2 - 24x + 16, (3x - 4)2, 4x2 - 25, (2x + 5) (2x - 5), 16x2 - 1, (4x + 1) (4x - 1), x2 + 3x - 10, (x + 5) (x - 2)

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