2x^2-3xy-2y^2+5x+5y-3=(2x+y)(x-2y)+6x+3y-x+2y-3=(2x+y)(x-2y)+3(2x+y)-x+2y-3=(2x+y)(x-2y+3)-(x-2y+3)=(2x+y-1)(x-2y+3)