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An animated guide to simplifying quadratic expressions and equations by completing the square. Examples are shown of how to complete the square to factorise any expression and to solve equations.
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Classroom Ideas

Use as a recap on completing the square. Discuss with students when to use this method and ensure they consider that it will not be necessary for simpler quadratic expressions. Demostrate how completing the square can be used to find turning points for quadratic functions and help students to sketch them.