4x^2-4xy-3y^2-4x+10y-3
=(2x-3y)(2x+y)-4x+10y-3
=(2x-3y)(2x+y)+(2x+y)-6x+9y-3
=(2x+y)(2x-3y+1)-3(2x-3y+1)
=(2x-3y+1)(2x+y-3)