How do you use the Change of Base Formula and a calculator to evaluate the logarithm $log_5 18$ ?

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Answer 1 · 2015-10-31T11:14:40

$log_{5}18=frac{ln(18)}{ln(5)}$ or $log_{5}18=frac{log_{10}(18)}{log_{10}(5)}$

$log_{a}b=frac{log_{c}(b)}{log_c(a)}$
for all positive real numbers a,b and c.

In this case, $a=5$ , $b=18$ , $c=e$ or $c=10$

How do you use the Change of Base Formula and a calculator to evaluate the logarithm log_5 18log_5 18?