More Lessons for Grade 9 Math
Examples, solutions, videos, worksheets, games, and activities to help Algebra students learn about how to derive the quadratic formula by completing the square.
The following diagram shows the Proof for the Quadratic Formula. Scroll down the page for more examples and solutions of how to proof or derive the quadratic formula.
Proof of Quadratic Formula
Deriving the quadratic formula by completing the square.
Deriving the Quadratic Formula
Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.
You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.