How do you solve #log_5 10 - log_5 x6 = 21#? Precalculus Properties of Logarithmic Functions Common Logs 1 Answer A. S. Adikesavan May 27, 2016 For both the equations # log_5 10-log_5 (6x)=21 and log_5 10-log_5 (x^6)=21#, there is no solution. In either case, I get negative x as solution and it is inadmissible. 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 1468 views around the world You can reuse this answer Creative Commons License