| Giver | Post | Date |
| wixon | Challenge: If f(3x + 2) = 9x² + 12x - 1, then f(k - 1) = | 11-Apr-2023 |
| loolah | Challenge: If f(3x + 2) = 9x² + 12x - 1, then f(k - 1) = | 16-Jun-2021 |
| jbbbatiste | Challenge: If f(3x + 2) = 9x² + 12x - 1, then f(k - 1) = | 17-Feb-2021 |
| Carcass | Challenge: If f(3x + 2) = 9x² + 12x - 1, then f(k - 1) = | 12-Aug-2018 |