4x² - 9 = 0 implies x is equal to :

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

2. $\dfrac{9}{4}$

3. $-\dfrac{3}{2}$

4. $\pm \dfrac{3}{2}$

If 4 is a root of the equation x² + kx - 4 = 0; the value of k is :

1. 3

2. -3

3. 2

4. -2

The equation 2x² - 3x + k = 0 is satisfied by x = 2; the value of k is :

1. -2

2. 2

3. 4

4. 3

If x² - 7x = 0; the value of x is :

1. 0 and 7

2. 7

3. 0

4. 0 or 7