Question

. Simplify : (a+b-c) (a-b+c)

Answer 1

Step-by-step explanation:

we will select one the multiply with whole bracket as I explained above...

Answer 2

Step-by-step explanation:

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