Which of the following quadratic equations has -1 as a root ?

1. x² + 5x + 6 = 0

2. 2x² - 3x + 1 = 0

3. 2x² + x - 3 = 0

4. 2x² - x - 3 = 0

The roots of the quadratic equation x² - 3x - 4 = 0 are

1. -4, 1

2. 4, -1

3. 4, 1

4. -4, -1

Solve the following equation:

3x² - 4x - 4 = 0