Which of the following is not a quadratic equation?

1. (x + 2)² = 2(x + 3)
2. x² + 3x = (-1)(1 - 3x)
3. (x + 2)(x - 1) = x² - 2x - 3
4. x³ - x² + 2x + 1 = (x + 1)³

If 3 is a root of the quadratic equation x² - px + 3 = 0 then p is equal to :

1. 4

2. 3

3. 5

4. 2