AMC 12A 2025 (Problem 19)

Let aa, bb, and cc be the roots of the polynomial x3+kx+1x^3+kx+1. What is the sum a3b2+a2b3+b3c2+b2c3+c3a2+c2a3?a^3b^2+a^2b^3+b^3c^2+b^2c^3+c^3a^2+c^2a^3?
(A)  -k\text{(A)}\;\text{-k}(B)  -k+1\text{(B)}\;\text{-k+1}(C)  1\text{(C)}\;1(D)  k-1\text{(D)}\;\text{k-1}(E)  k\text{(E)}\;\text{k}