Разложите на множители 4x^2-y^2+2x-y
4х²-у²+2х-у=(2х-у)(2х+у)+(2х+у)=(2х+у)(2х-у+1) _________________________________
(4x²-y²) + (2x-y) = (2x-y)(2x+y) + (2x-y) = (2x-y)(2x+y+1)