DescriptionOmar Kayyám - Geometric solution to cubic equation.png
English: Omar Kayyám - Geometric solution to cubic equation.
To solve the third-degree equation x3 + a2x = b Khayyám constructed the parabola x2 = ay, a circle with diameter b/a2, and a vertical line through the intersection point. The solution is given by the length of the horizontal line segment from the origin to the intersection of the vertical line and the x-axis.
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