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How to solve a quadratic equation by completing the square

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Examples, solutions, videos, activities and worksheets that are suitable for A Level Maths.

How to solve a quadratic equation by completing the square - tutorial 1
In this tutorial you are shown how to solve a quadratic equation that does not factorise easily by the method of completing the square.
Completing the Square : Tutorial 1 : ExamSolutions
This is a short tutorial taken from our many maths tutorials on completing the square.



Completing the Square - Tutorial 2 : ExamSolutions
This tutorial runs through completing the square for a quadratic expression where the coefficient of x squared is greater than 1.
The example given is 2x2 - x - 1
Completing the Square - Tutorial 3 : ExamSolutions
Completing the square - Tutorial 4 : ExamSolutions
In this 2nd example you are shown how to complete the square for a -2x2 term.

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.


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