Question about Texas Instruments TI-30XA Calculator

# I want to know how to enter basic logs into the calculator: Example. Log3^9=2 How can you enter this into the calculator?

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### kakima

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The 30XA only has logarithm functions for base e and base 10. However, you can calculate the logarithm to any base by using the relationship logb x = log x / log b = ln x / ln b

To calculate log3 of 9, press
9 LOG / 3 LOG =
or
9 LN / 3 LN =

Posted on Apr 03, 2011

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## Related Questions:

### Log base while graphing

Enter the base as the second argument, following a comma. For your example, enter it as logBASE(X,2) .

May 16, 2013 | Texas Instruments TI-84 Plus Calculator

### Entering,and working formulas with,Logarithms of Trigonometric Functions on a Casio fx-300MS.Converting Right Ascension to Ecliptic Longitude,without Latitude.Example:Log Cosine of Obliquity,(23.437778...

I am not sure there is a question expressed here. If you have a formula you want to use to calculate some quantity in it, state the formula, provide the known values and we will show you how to enter it. As to what it serves for, I for one do not need to know.

Sep 29, 2011 | Casio FX-300MS Calculator

### Log 10,000 - log 1,000 divided by 4 log 1.0125 = 46.34 I cannot enter this into my calculator and get 46.34 as in the example. is there a trick in the way to enter this? I have a TI-30X calculator....

Is the original problem (log 10,000 - log 1,000) / (4 log 1.0125) ? If so, press
( 1 0 0 0 0 LOG - 1 0 0 0 LOG ) / ( 4 * 1 . 0 1 2 5 LOG =
and you should see the expected result.

Jul 25, 2011 | Office Equipment & Supplies

### What button do you push on the TI-86 calculator to do the inv log function?

For the inverse natural log, press 2nd LN. For the inverse common log, press 2nd LOG.

For example, to calculate the inverse natural log of 2, press 2nd LN 2 ENTER and you'll get about 7.389 .

Jan 25, 2011 | Texas Instruments TI-86 Calculator

### Not sure how to do logs on the this calculator?

For common logarithm use the LOG key just below the blue 2nd key. For natural logarithm use the LN key just below the LOG key.

In either case, press the appropriate key, then type in the expression whose log you want, then the ) key. Type in whatever else there might be in the total expression, then the ENTER key.

For example, to calculate the natural log of 2:
LN 2 ) ENTER

Aug 16, 2010 | Texas Instruments TI-30 XIIS Calculator

### Negative log

Use the log function (common logarithm). See screen capture for markings on key.

To evaluate the negative of a logarithm
Enter the number (argument) of the logarithm
Press the = key to have it calculated.
While result is still displayed, press the sign change key or (+/-).

Beware that -log(number) is not necessarily a negative value.

Another way to calculate -log is to use the relation
log(1/a)=-log(a) .

3 [EXP] [(] [+/-] 2 [) ] [LOG][=] [+/-]

[EXP] is the key to enter exponent of a power of 10 :It is a shortcut, so no 10 is entered. Respect the key sequence above.
[ (] left parenthesis to prevent ambiguity due to the negaticve exponent. Just a security.
[)] is the enclosing right parenthesis
[+/-] is the Sign Change key

May 06, 2010 | Casio FX-260 Calculator

### How can I use the Log function on my calculator?

Hi ;

for log base 10 use the the "log" key

example :

log(2) + log(3) = log(6)

enter 2 press the log key you will get 0.30102999 press the '+" key than 3 log you should get 0.47712125 for it Press the "=" or enter and you should get 0.778151250 for a answer than press inv or 2nd log and you should get 6 for a answer

and that all there is to it

Oct 07, 2009 | Texas Instruments BA-II Plus Calculator

### How to calculate the antilog please

The antilog is the inverse of the logarithm. Not too surprisingly, it's invoked as the 2ND shift of the appropriate log key.

For the common antilog, use the 10^x key (2ND LOG). For example, 2ND LOG 3 ENTER gives 1000 as the common antilog of 3.

For the natural antilog, use the e^x key (2ND LN). For example, 2ND LN 3 ENTER gives 20.08553692 as the natural antilog of 3.

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### How to calculate log value in calculator with different base value

In any scientific calculator log2(n) can be  calculated with either ln or log function as follows

Log2(n)= ln(n) / ln(2)

Or
Log2(n)=log(n) / log(2)

both will give nearly the same answers

Dec 08, 2007 | Casio FX-300MS Calculator

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