(9x⁴ - 8x³ - 12x) x (3x) is equal to:

1. 27x⁵ - 24x⁴ + 36x²

2. 27x⁵ - 24x⁴ - 36x²

3. 27x⁵ + 24x⁴ - 36x²

4. 27x⁵ + 24x⁴ + 36x²

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

1. 3x³ + 4x² + 6

2. 3x³ + 4x² - 6

3. 3x³ - 4x² - 6

4. 3x⁴ - 4x² + 6

(x³ + y²) x 10x² is equal to :

1. 10x⁵ + 10xy

2. 10x⁵ + 10x²y²

3. 10x⁵ - 10x²y²

4. -10x⁵ - 10x²y²

(a³ - b³) ÷ (a - b) is equal to :

1. a² + b² + ab

2. a² + b² - ab

3. a² - b² + ab

4. a² - b² - ab