3 2 x - 6*x - x + 30
x^3 - 6*x^2 - x + 30 при x = 4
x^3 - 6*x^2 - x + 30
(4)^3 - 6*(4)^2 - (4) + 30
4^3 - 6*4^2 - 4 + 30
-6
3 2 30 + x - x - 6*x
30.0 + x^3 - x - 6.0*x^2
30 + x*(-1 + x*(-6 + x))
(-5 + x)*(-3 + x)*(2 + x)