(9x⁴ - 12x³ - 18x) ÷ (3x) is equal to:

1. 3x³ + 4x² + 6

2. 3x³ + 4x² - 6

3. 3x³ - 4x² - 6

4. 3x⁴ - 4x² + 6

$\Big(\dfrac{10}{3}xy^2z\Big)$ x $\Big(-\dfrac{9}{5}x^2z\Big)$ is equal io:

1. - 6x³y²z²

2. 6x³y²z²

3. $-\dfrac{2}{3}x^2y^2z^2$

4. $\dfrac{9}{5}xy^3z^2$

(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