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A Cubic Solution of Omar Khayyam

Author:
Moira Chas, John Golden
In the 11th century, Omar Khayyam classified all known cubics and gave geometric solutions for them. Shown here is one of his simpler cases, the solution of a cubic plus sides (linear term) equal to a number. Amazingly, Khayyam did not have graphing to do this, but constructed his parabolas geometrically. Luckily we have GeoGebra!
More GeoGebra at mathhombre.blogspot.com.

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