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

Solve the following equation and give your answer correct to 3 significant figures :

5x² - 3x - 4 = 0

Solve for x using the quadratic formula. Write your answer correct to two significant figures.

(x - 1)² - 3x + 4 = 0