3 2 3*n + 4*n - 1
3*n^3 + 4*n^2 - 1 при n = -4
3*n^3 + 4*n^2 - 1
3*(-4)^3 + 4*(-4)^2 - 1
-129
-1.0 + 4.0*n^2 + 3.0*n^3
2 -1 + n *(4 + 3*n)
/ 2\ (1 + n)*\-1 + n + 3*n /