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'Weekly Challenge 43: A Close Match' printed from http://nrich.maths.org/

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I was delighted to receive this solution from Niharika Paul, one of our younger solvers.

 

The actual functions plotted were as follows:

 

Two functions $f(x)$ and $g(x)$ were plotted on the same axes, where
$$
f(x) =\left(\frac{20}{x}\right)^x\quad \quad g(x) = 1568\exp\left(-\frac{(x-7.3576)^2}{17.6232}\right)
$$
The coefficients in $g(x)$ were chosen so as to make the function $g(x)$ match $f(x)$ as closely as possible for points past the maximum of $f(x)$

Their charts at various points are