PhET will help you check whether your calculations are correct. Simply input three data points and the resulting quadratic equation will appear. I want you to use this to confirm your calculations.
For those of you who wish to extend your investigation. This website provides an interactive simulation of how we can curve fit data points to model problems. For this investigation (and quadtratics in general) we only need 3 data points. However, many applications of curve fitting require large number of data to produce an accurate model.
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