Answer:
6a³ + a²-7
Explanation:
1. Get rid of the parentheses by distributing them.
(5a³ + 4a² − 3a + 2) + (a³ − 3a² + 3a − 9) = 5a³ + 4a² − 3a + 2 + a³ − 3a² + 3a − 9
2. Add like-terms.
5a³ + 4a² − 3a + 2 + a³ − 3a² + 3a − 9 = 6a³ + a²-7
Answer: 6a³ + a² - 7
(5a³ + 4a² − 3a + 2) + (a³ − 3a² + 3a − 9)=
5a³ + a³ + 4a² − 3a² - 3a + 3a + 2 - 9=
6a³ + a² - 0 - 7 = 6a³ + a² - 7
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