polynomial trend line

  1. M

    Incorrect Value From Trendline Equation (Polynomial)

    Hi everyone, I've encountered an issue while creating a series of graphs within Excel. The trendline seems correct and follows the data points I have nicely. Unfortunately, when entering the value for x into the equation manually in Table 1, the values differ greatly, percentage-wise. I have...
  2. B

    Polynomial trend line equation values?

    Hello- I am very green in Excel and my skills are limited, so pardon me if this question appears very non-trivial. I have two rows of data and I've created a trend line with 2nd order polynomial. I created the spreadsheet with data a while back so I don't recall all of the steps to do it...
  3. B

    Unusual Graph Formula

    I have produced a graph in excel and drawn a polynomial trendline onto it expecting to get some sort of qudratic equation along the lines of y = a + bx + cx2. It still produced a quadratic but in a slightly different form: y = -2E+06x2 + 8E+06x + 1E+06. I want to solve the equation for x but I...

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