How do you calculate ${log}_{7} 15$ $Log_7 15$ ?

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Answer 1 · 2016-06-14T12:44:49

${log}_{7} 15 = 1.39167$ $log_7 15=1.39167$

As ${log}_{a} b \times {log}_{b} c = {log}_{a} c$ $log_abxxlog_bc=log_ac$

${log}_{b} c = \frac{{log}_{a} c}{{log}_{a} b}$ $log_bc=log_ac/log_ab$

Hence ${log}_{7} 15 = \frac{log 15}{log 7} = \frac{1.1761}{0.8451} = 1.39167$ $log_7 15=log15/log7=1.1761/0.8451=1.39167$

How do you calculate log715Log_7 15 ?