1. (5n+1)(n-1)
2. (2n-1)(n+3)
3. (7n+1)(n-2)
4. (3t-1)(t+5)
5. (4t-7)(t-1)
6. (6t-1)(t+1)
7. (3t+1)(t-7)
9.5m questions
12.2m answers