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Anonymous
ab-2ac+b^2-2bc
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(b-c)(a+b)-ac
If you mean (a-b+c)^2, then... a^2 - ab + ac - ab + b^2 - bc + ac - bc + c^2 = a^2 + b^2 + c^2 - 2ab + 2ac - 2bc.
(a + b)(b + c)