Question

simplify:(x+y+z)(x+y-z)​

Answer 1

Answer:

(x^2+y^2+2xy)-z^2

Step-by-step explanation:

(x+y+z)(x+y+z)

[(x+y)+z][(x+y)-z]

Using- (a+b)(a-b)=a^2-b^2

(x+y)^2-z^2

Using-(a+b)^2=a^2+b^2+2ab

(x^2+y^2+2xy)-z^2