How do you use the Change of Base Formula and a calculator to evaluate the logarithm log_4 27log427? Precalculus Properties of Logarithmic Functions Functions with Base b 1 Answer Lucy Jul 11, 2018 log_4 27=log_10 27/log_10 4=2.38log427=log1027log104=2.38 Explanation: log_a b=log_10b/log_10 alogab=log10blog10a log_4 27=log_10 27/log_10 4=2.38log427=log1027log104=2.38 Answer link Related questions What is the exponential form of log_b 35=3logb35=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 1logb1? What are some identity rules for logarithms? What is log_b b^xlogbbx? What is the reciprocal of log_b alogba? 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 1362 views around the world You can reuse this answer Creative Commons License