This calculator finds the equation of a parabola with vertical axis given three points on the graph of the parabola.

This calculator is based on the on solving a system of three equations in three variables described in Find Equation of Parabola Passing Through three Points - Step by Step Solver.

When at least two points are on a vertical line (x coordinate of A equals the x coordinate of B for example), no equation is found for a parabola with vertical axis. Numbers may be entered in decimal (example: 1.02) or fractional (example: 4/5) forms.

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