OK
1.
- 5n
-5, -10, -15, -20, ...
5. 11. 21, 35, ...
2.
2n - 6
6, 9, 14, 21, ..
3.
2n2 + 3
4. n2+ 3n + 1
5. n2 + 5
-4, -2, 0, 2, 4, ...
5, 11, 19, 29, ...​