Question

iii) (a + b + c)(a + b - c)​

Answer 1

Answer:

= (a+b+c)2

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Answer 2

Answer:

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

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