P(x)=5*(x^3/3)-4*(x^2/2)+6x
P(3)=5*(3^3/3)-4*(3^2/2)+6*3
P(3)=45-18+18
P(3)=45
Основное свойство первообразных
P(x)=5*(x^3/3)-4*(x^2/2)+6x +[b] C[/b]
P(3)=5*(3^3/3)-4*(3^2/2)+6*3+[b] C[/b]
P(3)=45-18+18+ [b]C[/b]
P(3)=45+[b] C[/b]