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How to Use the Quadratic Formula


Image of the quadratic formula
The Quadratic Formula

The Quadratic Formula

The quadratic formula can be used to solve every quadratic equation. It is very useful for solving quadratic equations that cannot be easily factored.


Does the quadratic formula provide more than two solutions?


The quadratic formula provides the solutions to a quadratic equation. These solutions are the x-values where the graph crosses the x-axis. A parabola can only cross the x-axis 0,1, or 2 times. Therefore, the quadratic formula can only provide 0,1, or 2 solutions.


What information is needed in order to use the quadratic formula to solve a quadratic equation ?


In order to use the quadratic formula, the following information is needed.

  1. The quadratic equation should be written in standard form.

  2. The values of a, b and c, with a≠0, needs to be identified.


How to Use the Quadratic Formula

Watch the video below which demonstrates how to use the quadratic formula.






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