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Technology/Technology Tips
Technology Tips: Investigating Zeros of Cubics with GeoGebra

David A. Miller Edited by Larry Ottman and Russell W. Gordon 

September 2011, Volume 105, Issue 2, Page 149

Abstract:
Author uses GeoGebra to show that tangent lines at the mean of two x-intercepts of a cubic with three real roots will pass through the third x-intercept.