8a - 4b + 16c + 12d =
(x + 1).3 - 5x. (x + 1) + (x + 1).x2 =
3a + 2b - 5c + 9d =
- 4. (- 2a + b - 4c - 3d)
4. (2a - b + 4c + 3d)
7. (3/7 a + 2/7 b - 5/7 c + 9/7 d)
(x + 1). (3 - 5x + x2)
