(a³ - b³) ÷ (a - b) is equal to :

1. a² + b² + ab

2. a² + b² - ab

3. a² - b² + ab

4. a² - b² - ab

Multiply :

8ab² by - 4a³b⁴

Multiply :

-5cd² by - 5cd²

Multiply :

4a and 6a + 7