x2 - 9
x2 - 4x + 4
x2 - 5x + 4
x2 - 3x
2m 2 - 9m + 10
(2m - 5)(m - 2)
x2 - 121
x2 - 8x + 16
x2 - x -6
10x2 - 6x
3x 2 + 20x - 63
(3x - 7)(x + 9)
x2 - y2
x2 - 20x + 100
x2 - 8x + 12
4x2 - 4
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