# Find the Derivative f(x) = natural log of 9x

Differentiate using the chain rule, which states that is where and .
To apply the Chain Rule, set as .
The derivative of with respect to is .
Replace all occurrences of with .
Differentiate.
Since is constant with respect to , the derivative of with respect to is .
Simplify terms.
Combine and .
Cancel the common factor of .
Cancel the common factor.
Rewrite the expression.
Differentiate using the Power Rule which states that is where .
Multiply by .
Find the Derivative f(x) = natural log of 9x