The value (values) of x satisfying the equation x² - 6x - 16 = 0 is/are :

1. 8 or -2

2. -8 or 2

3. 8 and -2

4. -8 or 2

Solve the following equation for x and give your answer correct to one decimal place :

x² - 8x + 5 = 0

Solve the following equation for x and give your answer correct to two decimal places :

2x² - 10x + 5 = 0