# Geometric Solution of a Quadratic Equation Using Carlyle's Circle

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This Demonstration shows the geometric solution of the quadratic equation using Carlyle's circle.

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Contributed by: Izidor Hafner (June 2017)

Open content licensed under CC BY-NC-SA

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Reference

[1] J. H. Conway and R. K. Guy, *The Book of Numbers*, New York: Copernicus Books/Springer, 2006 pp. 192–193.