Question about Texas Instruments TI-89 Calculator

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Can't chang the logbase

I looked in the instructional book that came on the calculator and it said to type on the problem and then select logbase and put in the base number. However, whenever I attempted it, I got syntax eror. If you could give me a step by step instructional I would much appreciate it!

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  • Space Ace Nov 12, 2008

    Here is an example of a problem I have to solve. Logbase 3 X 9^logbase3^27

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It's 2*3=6 but about the base, you can't change it in the calculators the default base it's 10 so log x it's Logbase 10^x here some logs:

log x base y = log x / log y
log (x*y) = log x + log y
log (x/y) = log x - log y
in your example log 9 base 3 = log 9 / log 3 etc.
hope you get it, and it was helpful

Posted on Jul 06, 2009

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1 Answer

How do I put in log to base 4 of x


That depends on the make and model of the calculator. A few calculators have a logBASE or similar function which takes an arbitrary base. Most only have logs to base e (ln) and base 10 (log).

However, the log of x to any base can be calculated on any calculator with logs as either
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Press LOG 3 ENTER.

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Press MATH, scroll down to the logBASE entry, then press ENTER. This will put "logBASE(" into the entry line. You can then enter the arguments and press ENTER to calculate the result. For example, to calculate the log base 2 of 8, press MATH, down-arrow a number of times to logBASE, press ENTER 8 , 2 ENTER. This should give you 3.

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If you want the log base 2 of 8, you want logBASE(2,8). You'll find the logBASE function in the catalog, accessible by pressing 2ND [CATALOG] ). CATALOG is the shifted function of the 0 key, the ) gets you to the Ls in the catalog.

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1 Answer

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The new OS's (2.53 MP and higher) have the MathPrint feature. However the new feature coexists with the old one CLASSIC and you can choose one or the other.
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then type in the value , base). Keystrokes would be [alpha] [f3] arrow and select logbase( , then [1] [(divide)
[4] [,] [4] [)] [=] . (your screen should look like logbase(1/4 , 4) = -1.

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Regardless of the firmware version, you can always compute the logarithm to any base by using the relationship

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