How do you calculate log_(1/2) (15)? Precalculus Properties of Logarithmic Functions Common Logs 1 Answer Shwetank Mauria Sep 16, 2016 log_(1/2)(15)=-3.9073 Explanation: Let log_(1/2)(15)=y Hence (1/2)^y=15. Now taking logarithm om both sides, we get ylog(1/2)=log15 or y=log15/log0.5 = 1.1761/(-0.3010 = -3.9073 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 2735 views around the world You can reuse this answer Creative Commons License