# How do you use the Change of Base Formula and a calculator to evaluate the logarithm log_4 27?

${\log}_{4} 27 = {\log}_{10} \frac{27}{\log} _ 10 4 = 2.38$
${\log}_{a} b = {\log}_{10} \frac{b}{\log} _ 10 a$
${\log}_{4} 27 = {\log}_{10} \frac{27}{\log} _ 10 4 = 2.38$