Calculate Best Fit Equation Of Curve
I am trying to calculate the equation of a curve which best fits some data. On the xaxis is date and yaxis the readings. The curve is quadratic, so on the chart I am fitting a 2nd order polyomial and displaying the equation. To prove that the equation the trendline gives me is reasonable, I am applying the equation on the x parameter to get the y parameter estimate and looking to see the error between predicted and actual  see attached.
The equation and the output from it are clearly rubbish, even though on the graph the trendline is a reasonable fit  see attached. Has anyone any ideas why? I think it has something to do with using a date on the xaxis but no idea why. Is there a way to correct for this? I also tried using the following I to calculate the coefficients which came up with a reasonable forecast (although linest should only be used for linear data): =LINEST(C3:C15,B3:B15^{1,2,3})
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