Question

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

Answer 1

Answer:

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

={(x+y)+z}{(x+y)-z}

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

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

Step-by-step explanation:

Answer 2

Step-by-step explanation:

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

x²+xy-xz+xy+y²-yz+xz+yz-z²

x²+y²-z²+2xy

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