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How do I change the base of a logarithm in the calculator?

 

For example, if I want to calculate log3(5), how do I set my logarithm base to 3?

 Aug 27, 2019
 #1
avatar+103148 
+2

On our calculator, type 

 

log (5, 3)     and hit  the  " = " key

 

This is the evaluation of  log 3 5

 

 

cool cool cool

 Aug 27, 2019
 #2
avatar+1342 
+2

um, CPhill is answering it and I'm sure his answer is more qualified.

 

But, you would basically put the normal log_2(5) on the numerator and log_2(3) on the denominator which is:

\(\frac{log_2(5)}{log_2(3)} \\OK\ so\ I\ used\ the\ change\ of\ base\ formula\ to\ do\ this... \\ \frac{log(5)}{log(3)} (simplify)\)

 

 

And you would enter that into your calculator.

 

(log(5))/(log(3))

 

But if you want to find out more about the change of base formula, I would suggest KhanAcdemy if you are not familiar with it...

 

link:

https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:logs/x2ec2f6f830c9fb89:change-of-base/a/logarithm-change-of-base-rule-intro

 Aug 27, 2019
edited by tommarvoloriddle  Aug 27, 2019
edited by tommarvoloriddle  Aug 27, 2019
edited by tommarvoloriddle  Aug 27, 2019
 #3
avatar+103148 
+2

Your answer is as good as mine, Tom.....the change-of-base works well, too.....

 

 

 

cool cool  cool

CPhill  Aug 27, 2019
 #4
avatar+1342 
+2

The title was the change of base...

So I thought it was something like that

tommarvoloriddle  Aug 27, 2019
edited by tommarvoloriddle  Aug 27, 2019

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