How do you use the Change of Base Formula and a calculator to evaluate the logarithm $log_15 7$ ?

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Answer 1 · 2016-02-09T01:43:28

The change of base rule is: $log_an = (logn)/(loga)$

$log_7(15) = (log15)/(log7)$

Now that both logs are in base 10, you can evaluate using a regular scientific calculator by pressing the button labelled "log".

Answer: 1.39

Hopefully this helps!

How do you use the Change of Base Formula and a calculator to evaluate the logarithm log_15 7log_15 7?