This is the equation we want to factorize:
x2 - 11x + 18
And there are two answers (the numbers are the same, but +/- signs are inverted):
1. (x - 2)(x - 9) = x2 - 9x - 2x -(-18) = x2 - 11x + 18
2. (-x + 2)(-x +9) = x2 -9x -2x + 18 = x2 - 11x + 18
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