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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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Q: How do you factor x squared minus eleven x plus eighteen?
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