Question about Texas Instruments TI-30XA Calculator

# I need to use a TI 30Xa to evaluate a Logarithm Log5 1/625 Not sure how to use the TI to do Log5

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### kakima

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Use the relation log5(x) = log(x) / log(5) = ln(x) / ln(5)

LOG ( 1 / 625 ) / LOG 5 =

or

LN ( 1 / 625 ) / LN 5 =

Posted on Mar 11, 2010

• BreFre Jul 06, 2011

Thank you very much

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## Related Questions:

### Change log base

The TI-30XA calculates logarithms to base e and base 10. You can calculate the log of x to any base b by calculating the logarithm of x and dividing it by the logarithm of b: log(x)/log(b) or ln(x)/ln(b).

Nov 29, 2013 | Texas Instruments TI-30XA Calculator

### What is the LN button for

It's for calculating the natural logarithm (logarithm base e).

Nov 17, 2013 | Texas Instruments TI-30XA Calculator

### How to fix error mesage on TI-30Xa. Every time I press LOG an error sign comes up. how do i fix this?

To take the log of a number, enter the number then press the LOG button, then the =. To take the log of a negative number, enter the negative number using the +/- key just to the right of the decimal point. To calculate the negative of a log, calculate the log and then negate it using +/-. To calculate the antilog (inverse logarithm), press 2nd then LOG.

Bear in mind that LOG is the common (base-10) logarithm. For the natural (base-e) logarithm, use the LN key to its right.

Nov 07, 2011 | 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?

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 =

Apr 03, 2011 | Texas Instruments TI-30XA Calculator

### HOW DO I TYPE IN LOG BASE 3 OF 18 IN MY TI 30X

You can calculate the log to any base by using the relationship logb(x) = log(x)/log(b) = ln(x)/ln(b). In words, the base-b logarithm of x is the logarithm of x divided by the logarithm of b.

So, to calculate the log base 3 of 18, press
1 8 LOG / 3 LOG =
or
1 8 LN / 3 LN =

Mar 06, 2011 | Texas Instruments TI-30XA Calculator

### How do I use the LOG button? For instance to solve pH= -log [1.0 x 10-3]

The log function evaluates the logarithm of the expression in the display. To compute the negative log of 10x10^(-3), press 1 EE +/- 3 LOG +/- =

Nov 21, 2010 | Texas Instruments TI-30XA Calculator

### How do I calculate antilog using a TI-30XA?

For common antilogarithm use 2nd [10^x]. For natural antilogarithm use 2nd [e^x]. Those are the shifted functions of the two logarithm keys.

These two functions operate on the expression already entered into the calculator.

Example: to calculate the natural antilogarithm of .7:
. 7 2nd [e^x] =

Sep 16, 2010 | Texas Instruments TI-30XA Calculator

### Where is the exponent button on the ti-30xa

If you're asking about entering powers of ten, use the EE (enter exponent) key just above the 7. If you're asking about exponentiation, use the y^x key just above the divide. If you're asking about antilogarithms, use the second shift of the appropriate logarithm key on the top row.

Jun 12, 2010 | Texas Instruments TI-30XA Calculator

### How do I find naperian logarithms?

Use the key marked LN (for natural logarithm (or Naperian logarithm)). It takes the log of the number currently in the display.

Feb 26, 2010 | Texas Instruments TI-30XA Calculator

### Natural logarithm with TI-30XA calculator

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.

Feb 20, 2009 | Texas Instruments TI-30XA Calculator

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