The degree of a quadratic equation is :

1. 1

2. 2

3. 3

4. none of these

The roots of the equation px² + qx + r = 0, where p ≠ 0, are given by:

1. $x = \dfrac{-p \pm \sqrt{q^{2} - 4pr}}{2p}$

2. $x = \dfrac{-q \pm \sqrt{q^{2} - 2pr}}{4p}$

3. $x = \dfrac{-q \pm \sqrt{q^{2} - 4pr}}{2p}$

4. $x = \dfrac{-q \pm \sqrt{q^{2} - 4pr}}{2q}$

For real roots of a quadratic equation, the discriminant must be:

1. greater than or equal to zero

2. greater than zero

3. less than or equal to zero

4. less than zero

If the roots of the quadratic equation, ax² + bx + c = 0, a ≠ 0 are real and equal, then each root is equal to:

1. $\dfrac{-a}{2b}$

2. $\dfrac{-b}{2a}$

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

4. $\dfrac{-c}{2a}$