# Quotient Derivative and Minima Maxima

## 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.

Last edited by a moderator:

## Answers and Replies

kuruman
Science Advisor
Homework Helper
Gold Member
How does one normally find the maxima and minima? Also, try plotting this function and see what you get.

Mark44
Mentor
Thread moved. Questions about derivatives should be posted in the Calculus section, not in the Precalculus section.

Hi,
I can't find the thread.

Zulfi.

Mark44
Mentor
Hi,
I can't find the thread.
The full title of the section is "Calculus & Beyond Homework."

kuruman
Science Advisor
Homework Helper
Gold Member
Hi,
I can't find the thread.

Zulfi.
You replied to it, so you have found it.

Hi,
I received an email that I got a reply from RPinPA . His reply is in my email but not here.

Zulfi.