Here's an example using the quadratic formula:

Solve: x² - 2x + 9 = 0

Using the quadratic formula, a = 1, b = -2, and c = 9.

See if you can fill in the missing numbers in some of the steps.

Move your mouse over the missing parts (in grey) to see the answer.

Complex Numbers Note: The solutions are conjugates because of the ± in the quadratic formula.