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Tried to form a slope equation for the polynomial trendline type with the date-time type value, but I couldn't be able to form a slope equation. here is the expected output image for reference. I didn't get any solution can you please help me to form a polynomial equation. Also, the R square value for exponential trendline type is different from the excel R square value for date-time type value when proceeding with the steps you gave above. Can you please help me with this issue?

Polynomial slope equation:

enter image description here

yuva
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    [HERE](https://www.ablebits.com/office-addins-blog/2019/01/16/excel-trendline-types-equations-formulas/) is a nice walk through on how to do it. – Scott Craner Aug 19 '21 at 18:45
  • I just answered your other question. I think it might answer this question. https://stackoverflow.com/questions/68548697/how-to-calculate-r-square-value-for-the-exponential-and-power-trendline-types/68853401#68853401 – Philip Aug 19 '21 at 19:16

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