(x^2+x-1)(x-4)
(x^2+x-1)(x-4) =
x (x^2+x-1) - 4(x^2+x-1) =
x^3 + x^2 - x - 4x^2 - 4x + 4 =
x^3 - 3x^2 - 5x + 4
