Prove that (a + b) ² = a² + 2ab + b²?

Prove that (a + b) ² = a² + 2ab + b²?
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Proof: ( a + b) ^ 2 = (a + b) * (a + b) [(a + b) (2 means ( a + b) multiplied by ( a + b) .] = a (a + b) + b (a + b) = a ^ 2 + ab + ba + b ^ 2 = a ^ 2 + ab + ab + b ^ 2 = a ^ 2 + 2ab + b ^ 2 Therefore , (a + b) ^ 2 = a ^ 2 + 2ab + b ^ 2
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