How do you evaluate #g(x)=log_bx# for #x=b^-3#? Precalculus Properties of Logarithmic Functions Logarithm-- Inverse of an Exponential Function 1 Answer Azimet Jan 18, 2017 #g(b^-3) = -3# Explanation: In general, #log_a a^n = n#, because #log_a b# is the power #a# must be raised to, to get #b#. So, in our case, #-3# is the power #b# needs to be raised, in order to get #b^-3#. #log_b b^-3 = -3#. 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 1878 views around the world You can reuse this answer Creative Commons License