Question

Simplify(a+b+c) (a+b-c) - 2ab​

Answer 1

Step-by-step explanation:

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Answer 2

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

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