Which equation for parabola coordinates

Husker70
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What equation do you use to find any cordinate on a symetrical parabola?
I've been hunting and hunting..
I have the x value.

Thanks,
Kevin
 
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Parabolic shapes are second order. That is

y = A*x^2 + b

If you only have x, then I would just assume A = 1 and b = 0.
 

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