Question 1090588
I would like to know if it's possible to calculate the equation {{{a*x^2-b*x-c}}} of a parabola from more than 3 coordinates (x;y).
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If it's known to be a parabola, 3 points define it.
The 4th point may not be on the parabola.
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If all 4 points are on it, use any 3 of them.
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A similar question:
Can you use 3 (or more) points to find the equation of a straight line?