Question

2. Simplify: (x+y+z)(x + y - Z)
plz answer it ​

Answer 1

Answer:

x2 + y2 -z2 + xy + zy

Step-by-step explanation:

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

= x*x + x*y + x*-z + y*z + y*y + y*-z + z*x + z*y + z*-z

= x2 + xy -xz + yz + y2 -yz + zx + zy -z2

= x2 + y2 -z2 + xy + zy