1. 83
2. -37
3. 64
4. 94
5. -85
6. 96
7. -48
8. -92
9. 65
10. 65
11. -32
12. -30
Answer:
Step-by-step explanation:
Sn = a1 * (1 - r^n)
----------
1 - r
n = 5 so answer =
1 * (1 - (1/2)^5
--------------- = 31/16
1 - 1/2
You can rewrite your function as

This implies that

Now, we have
, so it counts as a solution.
On the other hand, depending on the coefficient a, b and c, the cubic equation

can have either one or three solutions.
So, we have the solution x=0, and then one or three solutions coming from the cubic part. The equation as a whole thus have either two or four solutions, depending on the coefficients.