Question

If f(x)=ln(9+8x) find f'(x) .

How do I find the derivative with ln?

Answer 1

\[(ln(f(x)))' = \frac{1}{f(x)}*f'(x)\]

Answer 2

so would it be
\[\frac{ 1 }{ \ln(9+8x)} *\ln(9+8x)\] at first?

Answer 3

No, you have:
\[f(x)=9+8x\]

Answer 4

as an answer?

Answer 5

You need to find the derivative of:
\[ln(f(x))\]