I expect you have a limited number of decimals showing in the chart.
You can format the equation to display more.
Better yet use LINEST - see my website to use LINEST to get polynomial fit
www.stfx.ca/people/bliengme/ExcelTips
best wishes
--
Bernard V Liengme
www.stfx.ca/people/bliengme
remove caps from email

"Walter." wrote in message
...
In Excel I have added a polynomial trendline to a graph and clicked
'display
equation on chart'. The equation does not represent what the trendline
displays. The trendline line goes through all my 6 data points, but the
when
i use the equation it is wrong. Any idea's please.