Question about Texas Instruments TI-82 Calculator

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TI-82 I am attempting to calculate a natural logarithm. There is no INV key that I know of on this calcualtor although I do have an ex key. Any ideas on how I might go about doing this without the INV key or is there one on this model that I am not seeing.

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  • glovers4 May 22, 2008

    I need to find an antilogirithm. My chemistry book says to use the "inv" key and there isn't one on this calculator.

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I believe the natural logarithm key is the ln key, located below the log key. If you are trying to do the inverse of that (for example, if you are trying to solve a chem problem where you need e^x) then use 2nd ln.

Posted on Oct 05, 2008

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Hi,
Sorry to contradict you but there are many types of logarithms, the most important ones are
  1. the common logarithms (log in base 10),
  2. the natural logarithms (logarithms in base e)
  3. the binary logarithms (logarithms in base 2)
On calculators, the common logarithms are labeled [LOG], and the natural logarithms are labeled [LN].

The inverse function of the natural log function is the exponential (e^(x)), and the inverse of the log in base ten function is the function ten to the power of. It is called (sometimes) the antilog

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Question What is the antilog of 3.5678?
Answer The antilog of 3.5678 is 10^(3.5678) = 3696.579068
Verification: log(3696.57908) =3.5678

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Hi,

Logarithms in base 10 :Common logarithms
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Logarithms in base e : Natural logarithms
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Hope it helps.
Don't forget to rate the solution and don't be stingy: 4 thumbs up won't leave you any the poorer.

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I noticed that this calculator doesn't have a natural logarithm function as well. You can can always use the fact that
ln x = (log x) /log e or since log e is approximately .43429482
ln x = (log x)/.43429482. The greatest solution and it might be worth the 15 bucks or so to get a calculator with e^x and the natural logarithm function.


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