how did you get x2-3x +2 =x2-x-2x+2
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x2 - 3x + 2 = x2 - ( 1 + 2 )x + 2
= x2 - 1x - 2x + 2
= x2 - x - 2x + 2
= x2 - 1x - 2x + 2
= x2 - x - 2x + 2
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