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Z 4 x y. Z=9-X^2-Y^2. (X+Y)2-4(X+Y)=12 x2-XY=12. Z=16-X^2-Y^2. X^2+Y^2+Z^2=X*Y+Y*Z+X*Z.
Z=9-X^2-Y^2. (X+Y)2-4(X+Y)=12 x2-XY=12. Z=16-X^2-Y^2. X^2+Y^2+Z^2=X*Y+Y*Z+X*Z.

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