# The Quadratic Formula

Reference > Mathematics > AlgebraThe quadratic formula begins with the concept of completing a square.

Completing a square as a step in understanding the quadratic formula

How to use completing the square as a means for solving a quadratic equation

What happens when the coefficient of x squared isn't a perfect square?

What happens if the number you add to complete the square is itself not a perfect square?

Finally, we put everything we've done together in one great big formula!

# Understanding Coronavirus Spread

A Question and Answer session with Professor Puzzler about the math behind infection spread.

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