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Theory

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

When a sum 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}

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