Log Law: Change Base Explained w/Example

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SUMMARY

The discussion clarifies the change of base formula in logarithms, specifically stating that for positive bases \(a\) and \(b\) (distinct from 1) and a positive number \(c\), the relationship can be expressed as \( \log_{b}(c) = \frac{\log_{a}(c)}{\log_{a}(b)} \). This formula allows for the conversion of logarithms from one base to another, which is essential in various mathematical applications. An example provided illustrates the derivation of this formula using logarithmic properties.

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dilan
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Hi,
I am just a little confused with this log law of change base. Is there anyone who can give me a clear description with an example?:smile:
Thanks
 
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Let a,b>0, and distinct from 1 be the respective bases, and let c be an arbitrary positive number.

Then, you evidently have:
c=a^{log_{a}(c)}=b^{log_{b}(c)
Taking the logarithm with respect to a on both sides, you get:
\log_{a}(c)=\log_{b}(c)\log_{a}(b)
that is:
log_{b}(c)=\frac{log_{a}(c)}{log_{a}(b)}
Was that what you're after?
 

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