contestada

Can you factor these trinomials? thanks!
1. 5n^2-4n-1
2. 2n^2+5n-3
3. 7n^2-13n-2
4. 3t^2+14t-5
5. 4t^2-11t+7
6. 6t^2+5t-1
7. 3t^2-20t-7