# Quotient Derivative and Minima Maxima

Gold Member

## 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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Related Calculus and Beyond Homework Help News on Phys.org
kuruman
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.

Gold Member
Hi,

Zulfi.

Mark44
Mentor
Hi,
The full title of the section is "Calculus & Beyond Homework."

kuruman
Homework Helper
Gold Member
Hi,

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

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

Zulfi.