How do you solve #log(x+7) - log(x-7)=1#? Precalculus Properties of Logarithmic Functions Common Logs 1 Answer Shwetank Mauria · EZ as pi Jul 16, 2016 Answer: #x=77/9# Explanation: As #log(x+7)−log(x−7)=1#, we have #log((x+7)/(x−7))=1 = log 10# #(x+7)/(x−7)=10# or #x+7=10x-70# or #10x-x=77# or #9x=77# or #x=77/9# 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 892 views around the world You can reuse this answer Creative Commons License