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

If $x + \dfrac{1}{x}$ = 2.5, the value of x is :

1. 4

2. 5 and $\dfrac{1}{5}$

3. 2 or $\dfrac{1}{2}$

4. 2 and $\dfrac{1}{2}$

For quadratic equation $2x + \dfrac{5}{x}$ = 5 :

1. x ≠ 0

2. x = 1

3. x = 5

4. x = 2