How do you calculate #log_4 43# with a calculator? Precalculus Properties of Logarithmic Functions Functions with Base b 1 Answer Olivier B. Nov 17, 2016 #ln(43)/ln(4)# Explanation: If your calculator doesn't have the #log_4# function, you should know that the definition of #log_n(x)# is: #log_color(red)(n)(color(blue)(x))=ln(color(blue)(x))/ln(color(red)(n))# note : #log_10# is often written just #log# Answer link Related questions What is the exponential form of #log_b 35=3#? What is the product rule of logarithms? What is the quotient rule of logarithms? What is the exponent rule of logarithms? What is #log_b 1#? What are some identity rules for logarithms? What is #log_b b^x#? What is the reciprocal of #log_b a#? What does a logarithmic function look like? How do I graph logarithmic functions on a TI-84? See all questions in Functions with Base b Impact of this question 2429 views around the world You can reuse this answer Creative Commons License