If x² - 7x = 0; the value of x is :

1. 0 and 7

2. 7

3. 0

4. 0 or 7

The roots of the quadratic equation x² - 6x - 7 = 0 are :

1. -1 and 7

2. 1 and 7

3. -1 or 7

4. 1 and -7

The roots of the quadratic equation x(x + 8) + 12 = 0 are :

1. 6 or 2

2. -6 or -2

3. 6 and -2

4. -6 and -2