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

Find which of the following equations are quadratic :

5x² - 8x = -3(7 - 2x)

Find which of the following equations are quadratic :

(x - 4)(3x + 1) = (3x - 1)(x + 2)