Question about Texas Instruments TI-89 Calculator

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How I can get the log base 10 number in a TI 89

Please sende the steps

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  • raynold182 Mar 06, 2009

    How cn you type in 2log7 in TI-89?? can anyone give me instructions??

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"♦" "7" will give you log base 10 for the texas instuments TI-89 Titanium

Posted on Jan 06, 2010

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Press the catalog button, then scroll down to log( enter the number you are trying to get the log base 10 of and then close the parenthesis. Press enter and you should have your result.

Posted on Mar 04, 2009

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From my experience with an 89Ti it is ♦9
Sorry TI89 users it is in the CATALOG as log(

Posted on Feb 24, 2009

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Change base log


The TI 86 has two logarithmic functions: natural logarithm (ln) and common (decimal) logarithms (log). If you need the logarithm in any other base than e or 10 you need to use one of the two equivalent expressions
log_b(x) =ln(x)/ln(b) =log(x)/log(b)
Here b is the value of the base of the logarithm and x is the argument (the value whose logarithm you are seeking). Of course the argument x must be a positive number.
Note: On the TI 86 the log function can calculate the logarithm of a complex number, according to the manual.

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My ti-89 titanium won't graph logarithms (y1=22log(10)x)


The graph of y=22log(10) is a straight line, though it should go through (0,0) and (1,22). Log(10) is a constant 1, so the function is simply y=22x .

If you want "twenty-two times log-base-ten of x", write it as 22*log(x) .

Aug 11, 2012 | Texas Instruments TI-89 Calculator

1 Answer

Where can I find the log values in TI 89


For natural logarithms, you can use the ln function (2ND shift of the X key). For example, the natural logarithm of 3 is 2ND [LN] 3 ) ENTER.

For logarithms to other bases, use the log function (diamond shift of the 7 key). For example, the base-2 logarithm of 16 is diamond 7 1 6 , 2 ) ENTER. If the base is 10 (common logarithms), you can omit the comma and the second argument.

Mar 09, 2011 | Texas Instruments TI-89 Calculator

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How do you enter the log base on the TI 89 Titanium?


If you want to take the log base b of x, enter it as log(x, b).

To get log, you can either type it in or press diamond 7.

Nov 23, 2010 | Texas Instruments TI-89 Calculator

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How do I find logarithms on the ti89?


For natural logarithms, you can use the ln function (2ND shift of the X key). For example, the natural logarithm of 3 is 2ND [LN] 3 ) ENTER.

For logarithms to other bases, use the log function (diamond shift of the 7 key). For example, the base-2 logarithm of 16 is diamond 7 1 6 , 2 ) ENTER. If the base is 10 (common logarithms), you can omit the comma and the second argument.

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1 Answer

How do I calculate the inverse log on the TI-89?


Hello,
The wrong terminology is playing tricks on you.
  1. If you are talking about the natural logarithms, the inverse function of the natural log is the exponential: ln(e^(x))=e^(ln(x)) = x
  2. If you are talking about the common logarithms (log in base 10) to find the antilog of a number, say x, you raise 10 to the power of x.
Exemple: What is the antilog ( that is the name, not inverse log) of 0.345?
Answer; antilog of 0.345 = 10^(0.345) =2.21309471

Look at the last two commands on the screen capture.
393588e.jpg

Hope it helps
Thanks for using FixYa

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1 Answer

How do you calculate the inverse log.


Raise the base of your log to the power produced by the answer.

Example: If ln(x) = y, raise e (base of the natural logarithm) to the y to get x = e^y
Example 2: log(x) = y - x = 10^y

So if log(x) = 2, x = 10^2 = 100

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to do logarithms with other bases, use change-of-base. let's say you want to do log base 5 of 25. for clarity i'll write this as log(5) 25. you would have to do log(10) 25 / log(10) 5 to get 2. key sequence: [LOG], 2, 5, ), / (divide), [LOG], 5, )

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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

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There is no log (base 10) button on a TI-89. It's buried in the CATALOG as log(. As a shortcut, you can do ln(#)/ln(base), where # and base are replaced with what you want. For the inverse of a log, do the base raised to the part on the other side of the equals sign. So, log(x) = 2 would become 10^2 = x.

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