Right click on one of your data points and select Add trendline.
The trendline dialog boxes offers a number of options for
type of trendline, showing equations in chart etc.
Well, thanks for the advice, but I think since my curve is not linear or
something, it doesn't give me the Add trendline option. My curve looks like a
3rd order polynomial.
You have to be using an XY Scatter chart, not a line graph.
The scatter graph allows for polynomials from 2nd to 6th orders
amongst other options. How is your curve and data setup?
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