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I am having trouble finding an answer for this problem.

The problem requires me to find the maximum value of r for this equation:

[tex]r^{2}e^{\frac{-r}{a}}(1-\frac{r}{a}+\frac{r^2}{4a^{2}})[/tex]

I took the derivative and set it equal to zero but keep getting a high degree polynomial that I am not sure how to solve for r.

Any help would be appreciated.

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# Homework Help: Derivative of a Polynomial

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