Algebra-1

Step 1: Distribute the parentheses.
(9a³b − 4ab² +2b³) + (-5a³b + 6ab² − 4b³) is the same as 9a³b − 4ab² +2b³ − 5a³b + 6ab² − 4b³.

Step 2: Combine like terms.
Combine the terms with a³b: 9a³b - 5a³b = 4a³b.

Combine the terms with ab²: -4ab² + 6ab^2<...