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## Homework Statement

Find out the quotient derivative i.e. the derivative of polynomial upon polynomial and then find the minima and maxima.[/B]

##W\left(z\right)=\frac{{4z+9}}{{2-z}}##

## Homework Equations

##\left( \frac{f}{g} \right)' = \frac{f'\,g - f\,g'}{g^2}##

## The Attempt at a Solution

##W'\left(z\right)=\frac{{4\left({2-z}\right)-\left({4z+9}\right)\left({-1}\right)}}{{{{\left({2-z}\right)}^2}}}##

##=\frac{{17}}{{{4-4z+z^2}}}##

I have found the quotient derivative. Some body please help me how to find the minima and maxima

Zulfi.

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