Question

Evaluate (a+b+c)²- (a-b-c)²

Answer 1

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Answer 2

${a}^{2} + {b}^{2} + {c}^{2} + 2ab + 2bc + 2ca - ( {a}^{2} + { - b}^{2} + { - c}^{2} + 2a( - b) + 2( - b)( - c) + 2( - c)(a) \\ {a}^{2} + {b}^{2} + { c}^{2} + 2ab + 2bc + 2ca - {a}^{2} - {b}^{2} - {c}^{2} - 2ab + 2bc - 2ca \\ = 4bc$

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