Question

simplify (a+b+c) (a+b-c)​

Answer 1

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

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Answer 2

Answer:

i don't know but i will try my best to help you