The Quadratic FormulaReference > Mathematics > Algebra
The 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!
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