Quotient Derivative and Minima Maxima

[zak100]

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.

 

[kuruman]

How does one normally find the maxima and minima? Also, try plotting this function and see what you get.

 

[Mark44]

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

 

[zak100]

Hi,
I can't find the thread.

Zulfi.

 

[Mark44]

Hi,
I can't find the thread.

The full title of the section is "Calculus & Beyond Homework."

 

[kuruman]

Hi,
I can't find the thread.

Zulfi.

You replied to it, so you have found it.

 

[zak100]

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

Zulfi.