Question

simplify (x+y+z)(x+y-z)​

Answer 1

Step-by-step explanation:

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

x²+xy-xz+xy+y²-yz+xz+yz-z²

x²+y²-z²+xy

Answer 2

Answer:

x^2+3xy+y^2-yz-z^2

Step-by-step explanation:

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

= x^2+xy-xz+y^2-yz+xz+xy-z^2

= x^2+3xy+y^2-yz-z^2