Is x = 5 a solution of the equation x² - 2x - 15 = 0 ?

Is x = -3 a solution of the equation 2x² - 7x + 9 = 0 ?

The roots of the quadratic equation x² - 6x - 7 = 0 are :

1. -1 and 7

2. 1 and 7

3. -1 or 7

4. 1 and -7