(vi) (x + y + z) (x – y + z) + (x + y - z) (-x + y + 2) - 4zx
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(x+y+z) (x-y+z) + (x+y-z) (-x+y+2) - 4zx
= (x²-xy+xz + xy-y²+yz + xz-yz+z²) + (-x²+xy+2x + -xy+y²+2y + xz+-yz-2z) - 4zx
= z²-zx+2x+2y-2z. ans.....
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