Question 292594
 
3 a | + | 2 |  | 3 a^2 | - | 3 a | + | 1
9 a^3 | - | 3 a^2 | - | 3 a | + | 4
9 a^3 | + | 6 a^2 |  |  |  | 
 |  | -9 a^2 | - | 3 a |  | 
 |  | -9 a^2 | - | 6 a |  | 
 |  |  |  | 3 a | + | 4
 |  |  |  | 3 a | + | 2
 |  |  |  |  |  | 2

the book answer is correct