Question about Texas Instruments TI-89 Calculator

# How do I find logarithms on the ti89? - Texas Instruments TI-89 Calculator

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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.

Posted on Apr 28, 2010

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Use the ALPHA keyboard to enter log( or ln(. Alternatively use the CATALOG to displays the function on the command line, then enter the number and close the ) parentheis.

Posted on Apr 28, 2010

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## Related Questions:

### Logarithm

The Casio FX-300MS does not provide base 2 logarithms as a single key operation. However, you can use the natural logarithm (ln, base e = 2.7182818...) and the formula

log2 ( x ) = ln( x ) / ln( 2 )

To calculate the base 2 logarithm of 16, key in
[ln] 16 [/] [ln] 2 [=]
and get displayed the correct answer 4.

The same simple formula also works for any other base, and actually for any other logarithms provided by your calculator. The FX-300MS also provides a logarithm to base 10 (lg). You could also
type
[lg] 16 [/] [lg] 2 [=] to get the solution to the problem above, or
[lg] 25 [/] [lg] 5 [=] to get the base 5 logarithm of 25.

Mar 20, 2014 | Casio FX-300MS Calculator

### 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.

Sep 22, 2013 | Texas Instruments TI-86 Calculator

### I need to find the LOG button

There is no such thing. Instead, you'll find the logarithm functions in the MATH LOG menu. Press the MATH button then select LOG. There are two logarithm functions in the menu, log for common (base-10) logarithm and ln for natural (base-e) logarithm.

Oct 03, 2012 | Texas Instruments TI-73 Calculator

### TI-84 Calculator Gives Me the Wrong Logarithm Solution

"log(2)8" means "common logarithm of 2 multiplied by 8".

The TI-84 has three different logarithm functions.
log is the common (base-10) logarithm.
ln is the natural (base-e) logarithm.
logBASE lets you take the logarithm to any positive base.

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.

Sep 30, 2012 | Texas Instruments TI-84 Plus Calculator

### How to use the log fucntion

To calculate the natural logarithm of a number, enter the number and press the LN key. To calculate the natural logarithm of a calculated result, simply press the LN key.
To calculate the natural logarithm of 3, press 3 LN
To calculate the logarithm to any other base, calculate the natural logarithm and then divide by the natural logarithm of the base.
To calculate the base-10 logarithm of 3, press 3 LN / 1 0 LN =

Apr 04, 2012 | Texas Instruments BA-II Plus Calculator

### How to calculate log

For the common logarithm use the "log" key. For the natural logarithm use the "ln" key. Both keys are located near the upper-right corner of the keyboard.
To calculate the common logarithm of 3, press "log" "3" "=" . For the natural logarithm of 3, press "ln" "3" "=" .

Mar 29, 2012 | Casio fx-300ES Calculator

### If log 1000 = 3, how do I do this with my hp 12c calculator

The 12C does not have the common logarithm function built-in, but you can calculate it using the natural logarithm function (the blue g shift of the %T key, 2nd row, 3rd key).

The common logarithm of x is the natural logarithm of x divided by the natural logarithm of 10, or
log x = ln x / ln 10

Press 1 0 0 0 g [LN] 1 0 g [LN] /
and you'll get the result 3.

Jun 06, 2011 | HP 12c Calculator

### 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

### Using the correct key combination to determine inverse log

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

Ex:
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

Hope it helps.

Nov 29, 2009 | Texas Instruments TI-30XA Calculator

### How to use the Logerithmic function on this calculator

Hi,

Logarithms in base 10 :Common logarithms
1. The calculator has a key labeled [LOG]. It allows you to calculate the common logarithms (logarithms in base 10).
2. To calculate the common logarithm of a (positive) number you type in the number, press the [LOG] key .
3. Ex: 15.32 [LOG][=] gives 1.1852558765
Logarithms in base e : Natural logarithms
1. The calculator has a key labeled [LN]. It allows you to calculate the natural logarithms of positive numbers.
2. Ex: natural log of 15.32 is entered as
3. 15.32 [LN] gives 2.729159164
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.

Nov 23, 2009 | Texas Instruments TI-36 X Solar Calculator

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