/ab\
log3|----|
\c2/
/ X \
Use the rule: logB|-----| = logBX - logBY
\ Y /
to rewrite the above as:
log3(ab) - log3c2
Use the rule logB(XY) = logBX + logBY to
rewrite the first term:
log3a + log3b - log3c2
Use the rule logBXY = Y·logBX to
rewrite the last term:
log3a + log3b - 2·log3c
Edwin