pq Express log b 5 9 m b OA log b 46 OB log b 46 pq 5 9 mb 46 pq mb 4 log p 6log bq 5logm 9 log 4 6 logpq log 5 logbm log9 5 9 46 pq OC log 5 9 m b in terms of sums and differences of logarithms 46 p q OD log 5 9 mb log 4p log6q log 5m 9 4 logpq 6 5 logbm 9 logb