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Answer:
6a^3 + 5a^2 - 6a - 2
Step-by-step explanation:
(4a^3 + 5a^2 - a + 1) - (5a - 2a^3 + 3)
Combine like terms
4a^3 - (-2a^3) = 6a^3 (- times - = +)
-a - 5a = -6a
1 - 3 = -2
Now combine the answers in standard form (don't forget the 5a^2)
6a^3 + 5a^2 - 6a - 2