D. Determine the perfect quadratic trinomial (PQT) or quadratic (QI) only or non-factorable (NF) and factor the factorable.

1. x² + 10x + 9
2. x² - 14x + 49
3. 4a² - 16a + 16
4. a² + 9a + 20
5. a² - 5a - 6
6. z² - 5z + 6
7. m² + m - 6
8. 9n² - 34nm + 25m²
9. 9n² - 34nm +25m²
10. 3y² - 2y - 5