Answer
$9x$
Work Step by Step
RECALL:
$\ln{e^b}=b$
Use the rule above with $b=9x$ to obtain:
$\ln{e^{9x}}=9x$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.