Question

(x+y+z)² +2(x-y+z) (y-z-x) +(y-z+x)² ​

Answer 1

Answer:

The answer is

$8xy - 4xz + 4yz$

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Answer 2

Answer:

(x-y-z)²-(x+y-z)²

(x²+y²+z²-2xy-2xz+2yz)-(x²+y²+z²+2xy-2xz-2yz)

x²y²+z²-2xy-2xz+2yz-x²-y²-z²-2xy+2xz+2yz

= -4xy+4yz