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

Solve the following equation by factorisation:

(x + 1)(2x + 8) = (x + 7)(x + 3)

Solve the following equation by factorisation:

4(2x - 3)² - (2x - 3) - 14 = 0