Answer:
7n^3 + 6
Step-by-step explanation:
(4 + 2n^3) + (5n^3 + 2) =
= 2n^3 + 5n^3 + 4 + 2
= 7n^3 + 6
(4 + 2n^3) + (5n^3 + 2)
4 + 2n^3 + 5n^3 + 2
