Answer
$8$
Work Step by Step
First, use the fact that $\ln e^a=a$ to simplify the expression to $$2 \ln e^4=2(4)=8$$
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.