4x^2-3x^2-( )=5x^2+4xy-3y^2
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4x^2-3x^2-()=5x^2+4xy-3y^24x^2-3x^2-()=5x^2+4xy-3y^24x^2-3x^2-()=5x^2+4xy-3y^24x^2-3y^2-(-x^2-4xy)=5
4x^2-3x^2-( )=5x^2+4xy-3y^2
4x^2-3x^2-( )=5x^2+4xy-3y^2
4x^2-3x^2-( )=5x^2+4xy-3y^2
4x^2-3y^2-(-x^2-4xy )=5x^2+4xy-3y^2
()=(4x^2-3x^2)-(5x^2+4xy-3y^2)
=4x^2-3x^2-5x^2-4xy+3y^2
=-4x^2-4xy+3y^2
=3y^2-4xy-4x^2
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