Non linear equations: howto?

[Fabrice DELENTE]

> > My problem is that I have the curve of f, and I'd like to find its equation;
> > I guessed that f is of the form (a*x+b)*exp(c*x+d)+e, and I'm trying to find
> > the right values for a,b,c,d and e.
> 

> This is impossible to solve. E.g. d can be anything, so I suggest making
> it 0.

Well I tried on geogebra to find a solution visually, and it seems possible;
why do you say it is impossible?

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Fabrice DELENTE