Question

(a + b - c)(a + b + c)

Answer 1

noted

Answer 2

assuming you want to just multiply
((a+b)-c)*((a+b)+c)
can you multiply just the following:
(u-c)(u+c)

Answer 3

a^2+2ab+b^2−c^2

Answer 4

@ageta Please do not just give out direct answers.

Answer 5

sorry

Answer 6

I need to use the foil method but i dont know how to

Answer 7

(a+b−c)(a+b+c)
=(a+b+−c)(a+b+c)
=(a)(a)+(a)(b)+(a)(c)+(b)(a)+(b)(b)+(b)(c)+(−c)(a)+(−c)(b)+(−c)(c)
=a^2+ab+ac+ab+b^2+bc−ac−bc−c^2
=a^2+2ab+b^2−c^2

Answer 8

multiply (u-c) and (u+c) first

Answer 9

\[(u-c)(u+c) \\ u^2-c^2 \\ u=a+b \\ (a+b)^2-c^2\]

Answer 10

now multiply the (a+b)^2 out

Answer 11

you will get the same result as someone else mentioned