Question

(a+b-c)(a+b+c) Someone help me please!

Answer 1

You can multiply each member as follows:

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

Combine all the above multiplications to get:

a^2+2ab-ac^2+ac+b^2-c^2

Answer 2

okay, thank youuuu. (: