Question

(a+b+c)(a+b-c) ans fast​

Answer 1

Answer:

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

Step-by-step explanation:

This is the answer