Algebra-1

Step 1: Distribute the parentheses.
(4a³ − 8a − 4a²) + (7a³ − 7 − 6a) is the same as  4a³ − 8a − 4a² + 7a³ − 7 − 6a

Step 2: Combine like terms.
Combine the terms with a³: 4a³ + 7a³ = 11a³.

Combine the terms with a²: ...