How do you express log_7 5 in terms of common logs?

1 Answer
Momo
Nov 20, 2016

log5/log7

Explanation:

A common log is a log to the base of 10. Logs to the base of 10 are usually simply written as logx rather than log_10x, so keep that in mind for my explanation.

The change of base formula states that log_ab=logb/loga.
Therefore, log_7 5=log5/log7.

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