# How do you use the Change of Base Formula and a calculator to evaluate the logarithm log_5 23?

$\ln \frac{23}{\ln} 5$
We can change the base to either 10 or e, both of which are available on a scientific calculator. If base is changed to e, the given ${\log}_{5} 23$= $\ln \frac{23}{\ln} 5$ . Both ln 23 and ln 5 can be evaluated now using a calculator.