How do you condense #log345 – log39#? Precalculus Properties of Logarithmic Functions Common Logs 1 Answer José F. May 12, 2016 #log(115/13)# Explanation: #log 345-log 39=log(345/39)=log((cancel(3)xx5xx23)/(cancel(3)xx13)))=log(115/13)# Answer link Related questions What is the common logarithm of 10? How do I find the common logarithm of a number? What is a common logarithm or common log? What are common mistakes students make with common log? How do I find the common logarithm of 589,000? How do I find the number whose common logarithm is 2.6025? What is the common logarithm of 54.29? What is the value of the common logarithm log 10,000? What is #log_10 10#? How do I work in #log_10# in Excel? See all questions in Common Logs Impact of this question 1463 views around the world You can reuse this answer Creative Commons License