Solve the following equation using quadratic formula:

3x² - x - 7 = 0

Solve the following equation using quadratic formula:

4x² - 7x + 2 = 0

Solve for x the quadratic equation x² - 4x - 8 = 0. Give your answer correct to three significant figures.

Solve the following quadratic equation : x² + 4x - 8 = 0. Give your answer correct to one decimal place.