Question

Simplify the following expressions:
(i) (x + y + z)(x + y – z)

Answer 1

Step-by-step explanation:

(x+y+z)(x−y−z) ( x + y + z ) ( x - y - z ).

Expand

(x+y+z)(x−y−z) ( x + y + z ) ( x - y - z ) by multiplying each term in term in the first expression by each term in the second expression.

Simplify terms

x²-y²-yz-zy-z²

Subtract zy from -yz

x²-y²-2yz-z²