In this case, we'll have to carry out several steps to find the solution.
Step 01:
Data
3x³ - 12x + 5 / x + 1
Step 02:
3x³ - 12x + 5
x = -1
- 1 | 3 0 12 5
| -3 3 -15
_______________
3 -3 15 -10
3x ² - 3x + 15 - 10/x+1
The answer is:
[tex]3x^2-3x+15-\frac{10}{x+1}[/tex]