f(x-1)=x^(3)+3x^(2)+3x+1 = (x-1)^(3)

тогда f(x) = x^(3)

Не согласна f(x-1) = x^3+3*x^2+3*x+1 = (x)^3; тогда f(x) = (x+1)^3

Проверяем при x = 0 f(x-1)= 1 f(0) = (x+1)^3 = 1

при x= -1 f(x-1) = -1+3-3+1=0 и f ( x) = (x+1)^3 = (-1+1)^3=0