How do you evaluate #f(x)=log_10x# for #x=4/5#? Precalculus Properties of Logarithmic Functions Logarithm-- Inverse of an Exponential Function 1 Answer Binayaka C. Jun 19, 2017 # f(4/5) ~~ -0.097(3dp)# Explanation: #f(x)= log_10x ; x=4/5 :. f(4/5)= log_10(4/5) = log_10 4 -log_10 5# #~~ 0.602-0.699 ~~ -0.097(3dp)# # f(4/5) ~~ -0.097(3dp)# [Ans] Answer link Related questions What is a logarithm? What are common mistakes students make with logarithms? How can a logarithmic equation be solved by graphing? How can I calculate a logarithm without a calculator? How can logarithms be used to solve exponential equations? How do logarithmic functions work? What is the logarithm of a negative number? What is the logarithm of zero? How do I find the logarithm #log_(1/4) 1/64#? How do I find the logarithm #log_(2/3)(8/27)#? See all questions in Logarithm-- Inverse of an Exponential Function Impact of this question 1461 views around the world You can reuse this answer Creative Commons License