d(-4+2x-2x^2+3x^3)/dx=d(-4)/dx + d(2x-2x^2+3x^2)/dx=d(2x)/dx +d(-2x^2+3x^3)/dx=2 d(x)/dx + d(-2x^2)/dx + d(3x^3)/dx= 2-2x d(x^2)/dx + 3 d(x^3)/dx=2-4x+9x^2