# Find the partial derivatives of the function

1. Feb 26, 2009

### cwesto

The problem:
f(x,y)=-$$\frac{-7x-2y}{9x+7y}$$

find:

fx(x,y)
fy(x,y)

The attempt:

fx(x,y)=$$\frac{-7-2y}{9+7y}$$
fy(x,y)=$$\frac{-7x-2}{9x+7}$$

Questions:

I'm not exactly sure how to find the partail derivative with a fraction like this one.

2. Feb 26, 2009

### Oerg

use the quotient rule for differentiation? or product rule but with (9+7y)^(-1) for eg.

is this homework? it looks like the wrong forum to me

3. Feb 26, 2009

Oh sorry.