7/27/2019 Geometric visual of solving the roots of a cubic equation --Tony Foster

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Omar Khayyam (10th Century) conic solution for cubic equationsby Tony Foster

X3 + CX = DParabola = X2/C

Diameter of Solution circle = D/C

X3 + 9X - 25X3 + 9X = 25

Parabola = X2/9 X2/3

Diameter of Solution circle = 25/9 2.77

Start at origin (0, 0) when graphing solution circle diameter. Where the circle and the

parabola intersect draw a line perpendicular to the X-axis. The point on the X-axis is theroot for the equation.