A. Find the Common Monomial Factor
1. 3x² - 6x
2. 18b³ + 24b²
3. 3m - 3n + 3

B. Difference of Two Squares
4. a² - 121
5. 100 + 36d²
6. 144r⁴ - 1

C. Sum and Difference of Two Cubes
7. r³ + 1000
8. 27c³ - d³
9. a6b9 + 343

D. Perfect Squre Trinomial
10. b² + 12b + 36
11. c⁴ - 2c² + 1
12. 49h² + 28hk + 4k²

E. Quadratic Trinomial
13. x² - 9x + 20
14. y² + 9y + 18
15. w² + w - 42​