[tex](-3x+4y)(5x+2y)-4*(xy-2)=-15x^{2}-6xy+20xy+8y^{2}-4xy+8=-15x^{2}+8y^{2}+10xy+8[/tex]
:)
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[tex](-3x+4y)(5x+2y)-4*(xy-2)=-15x^{2}-6xy+20xy+8y^{2}-4xy+8=-15x^{2}+8y^{2}+10xy+8[/tex]
:)