How to Find a Quadratic Equation from a Table
Find the second differences in y-values for equal intervals of x. If they are constant, it's quadratic. Then, determine a, b, and c using point substitution.
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Look for a constant second difference in the y-values. If it's there, you've got a quadratic! Then use the points to set up and solve the system of equations to find the coefficients.
This is pretty straightforward, guys. Use a quadratic regression calculator online. Done and done!
Just plot the points and see if they form a parabola. If they do, fit a quadratic curve using regression.
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