factor the following number

1. 4x 2 + 20x
2. 6x 2 + 36x
3. 2x 2 + 16x
4. 3x 2 - 27x
5. 3x 2 - 30x
6. x3 + 8 x + 15
7. x 2 + 10 x + 15
8. x 2 + 5 x + 6
9. x 2 + 14 x + 45
10. x 2 + 13 x + 36​