(a – b) _________ = a^2 – 2ab + b^2
(a – b) (a - b) = (a - b)^2= a^2 – 2ab + b^2
(a – b) (a - b)= a × (a - b) – b × (a - b)
= a^2 – ab – ba + b^2
= a^2 – 2ab + b^2
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