Hello, we rewrote this log expression:
ln6 - ln15 + ln20
to become
ln(6/15 + 20)
which was simplified to:
ln(2/3 + 4)
and which then:
= ln 8.
The problem is I cant see how the last step occurred eg. ln(2/3 + 4) becoming ln 8.
Thank you for any help in understanding this step.