Chris -

Probably you are not looking at the equation with sufficient digits.
Select the formula, and use the Increase Decimal button on the
Formatting toolbar, or apply a scientific number format with lots of digits.

- Jon
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Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
_______

Chris wrote:

When describing a trendline for a polynomial, the curve seems to have good
agreement with the original data, however the displayed equation does not fit
this fitted curve. There is no agreement with the equation and the trendfit
line.

Has anyone else observed this.