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$ (a-b)^2=a^2-2ab+b^2 $

Theory

$(a - b)^{2} = a^{2} - 2 a b + b^{2}$

When a difference of two terms is squared it can be multiplied and written as a trinomial. $(a - b)^{2} = (a - b) (a - b) = a^{2} - a b - a b + b^{2} = a^{2} - 2 a b + b^{2}$