Question

a2+2ab+b2=(a+b)2 proved that

Answer 1

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Answer 2

${(x + y)}^{2} \\ = (x + y)(x + y) \\ = x(x + y) + y(x + y) \\ = {x}^{2} + xy + xy + {y}^{2} \\ = {x }^{2} + 2xy + {y}^{2}$