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Geometric Quadratic Demonstration

Author:
Anthony
Topic:
Geometry
A representation of a geometric technique employed by Descartes for solving quadratics in the form shown. The distance between B and C, and the distance between B and D, give the two positive roots of the equation. Note: since only valid for positive roots, while this demonstration can investigate what happens when b is not less than a/2, this is the range for which the result holds.