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

2x² - 10x + 5 = 0

Solve the following equation for x, giving your answer correct to 3 decimal places :

3x² - 12x - 1 = 0

Solve the following equation for x, giving your answer correct to 3 decimal places :

x² - 16x + 6 = 0