For this case we have the following polynomials: 4x ^ 5 + 6x ^ 3 + 3 3x ^ 3 + x + 9 Adding we have: (4x ^ 5 + 6x ^ 3 + 3) + (3x ^ 3 + x + 9) We group in similar terms: x ^ 5 (4) + x ^ 3 (6 + 3) + x (1) + (9 + 3) Rewriting we have: 4x ^ 5 + 9x ^ 3 + x + 12 Answer: 4x ^ 5 + 9x ^ 3 + x + 12 option C
