LINEST and LOGEST can calculate the coefficients of chart trendlines
that have explicit formulae, e.g. http://www.stfx.ca/people/bliengme/ExcelTips/Polynomial.htm
Assuming that there is a nontrivial maximum, you could then use Solver
to find it if you don't want to do the calculus.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.