How to do bases change a formula? Precalculus Properties of Logarithmic Functions Common Logs 1 Answer Daniel L. Feb 12, 2018 See explanation. Explanation: To change a base of #log_a x# from #a# to #b# you have to use the formula: #log_a x=(log_b x)/(log_b a)# ## 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 1164 views around the world You can reuse this answer Creative Commons License