Question

simplify ( a+b+ c)(a+b-c)​

Answer 1

Step-by-step explanation:

a^2+b^2+c^2

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Answer 2

Answer:

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

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