Question

ln(e^5x)=15

Answer 1

since
\[\Large \ln(a)^b==b \ln(a)\]
so it becomes
\[\Large \implies 5x(\ln(e))=15\]
also since
\[\Large \ln(e)=1\] (because the base of ln is e)
\[\Large \implies 5x(1)=15\]
\[\Large \implies 5x=15\]
does this help ?