Question

SIMPLIFY GIVE MEDALSSSSS!!!!
(a + b - c)(a + b + c)

Answer 1

When i multiplied it al out I got a^2 + ab+ac+ab+b^2+bc-ac-bc-c^2

Answer 2

sO YOU GET A^2 +AB^2+B^2-C^2

Answer 3

than you consider - note (a+b) = x so will get

(x-c)(x+c) so what is formula for difference of perfect squares so do you know

(x-c)(x+c)= ?

and after you get the result here dont forget it that x=(a+b) so in this result resubstitute the (a+b) in place of x and will get the right answer

hope you understand it easy