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What is answer log5 (log25 2/5)= - Texas Instruments TI-30XA Calculator

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The expression is ambiguous. You need to make it clear. Is it log_5 of log_25(2/5)? If that is the case then your expression is undefined because log_25(2/5) is negative (=-0.284661721) and a negative number cannot be inside a logarithm.
Be it as it may, the calculator does not calculate the log in bases other than 10 or e.
log_b(a)=log(a)/log(b)=ln(a)/ln(b)

Posted on Jan 21, 2013

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Posted on Jan 02, 2017

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Most calculators can't do logs in different bases, but you can solve for the answer this way:

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How do I use the Log button on this calculator? For example, I can't do the expression Log5(25) which equals 2. It turns out all funny.


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mib8888_1.gif
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1 Answer

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