1. 4a⁴b² + 12a²b - 8ab
4ab (a³b + 3a - 2).
2. x (x - 2) + y (x - 2)
(x - 2) · (x + y).
3. ab - ac + 2b - 2c
(ab + 2b) - (ac + 2c)
b (a + 2) - c (a + 2)
(a + 2) · (b - c).
4. 100x² - 9
(10x - 3) (10x + 3).
5. 3x² + 6xy + 3y²
3 (x² + 2xy + y²).
a² - 2a + 1
6. a - 1
(a - 1)²
a - 1 = a - 1.
7. (2a - 3b) (2a + 3b) - 4a²
4a² - 9b² - 4a²
-9b².
8. (x - 3)² = 0
x = 3.
9. x² + 9x = 0
x (x - 9) = 0
x = 0 и x = 9.