Question

Find the product of
(a+b+c) (a+b-c)

Answer 1

Answer:

2a2bc

Step-by-step explanation:

a+a=2a

b+b=2b

+c-c=c

Answer 2

Answer:

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

I hope it will help you out