(-x^2+3xy-1/2y^2)-(- 1/2x^2+4xy- 2/3y^2)=
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(-x^2+3xy-1/2y^2)-(-1/2x^2+4xy-2/3y^2)=(-x^2+3xy-1/2y^2)-(-1/2x^2+4xy-2/3y^2)=(-x^2+3xy-1/2y^2)-(-1/
(-x^2+3xy-1/2y^2)-(- 1/2x^2+4xy- 2/3y^2)=
(-x^2+3xy-1/2y^2)-(- 1/2x^2+4xy- 2/3y^2)=
(-x^2+3xy-1/2y^2)-(- 1/2x^2+4xy- 2/3y^2)=
-1/2x^2-xy+1/6y^2
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