1. Mar 5, 2007

### Weave

1. The problem statement, all variables and given/known data
Ok, so our professor gives us homework online which we submit online, its called webwork. This one equation I found the derivitive of. Heres the thing, the program will not evalute answers with log base other than 10.

2. Relevant equations
The equation is:
$$y=4^xlog_{9}(x)$$
This is the derivitive
$$4^xln(4)log_{9}(x)+\frac{4^x}{xln(9)}$$

3. The attempt at a solution
How do I express this by having no logs?

Last edited: Mar 5, 2007
2. Mar 5, 2007

### Weave

Never mind,,
i realized I have to use the change of base formula, lol