Solving the Derivative of 4^xlog_9(x) Without Logs

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Homework Statement

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.

Homework Equations

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

The Attempt at a Solution

How do I express this by having no logs?

 

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