Two Tangent Lines to a Parabola

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Two tangent lines to the graph of intersect in a point that is horizontally equidistant from the points of tangency.

Contributed by: Soledad Mª Sáez Martínez and Félix Martínez de la Rosa (March 2011)
Open content licensed under CC BY-NC-SA


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Reference: M. Stenlund, "On the Tangent Lines of a Parabola," The College Mathematics Journal, 32(3), 2001 pp. 194–196.



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