Question about Texas Instruments TI-83 Plus Calculator

# How do you input a logarithm base into the ti83 plus?

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### Anonymous

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You can't it's default 10 so learn this logs:
log x base y = log x / log y
log (x*y) = log x + log y
log (x/y) = log x - log y
so just divide the logs
hope it helps

Posted on Jul 06, 2009

### Anonymous

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2logax-4logay^3

Posted on Nov 17, 2010

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× ## Related Questions:

### What is the e mean on a ti83 plus calculator

e is a mathematical constant just like pi. It's value is ~ 2.71828

Jun 28, 2014 | Texas Instruments TI-83 Plus 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

By 'log inverse', you presumably mean the inverse of the logarithm function. There are two logarithm functions on most scientific calculators. Firstly [ln], or natural logarithms, to the base e, where the inverse is e^x. Secondly [log], or logarithms to the base 10, where the inverse is 10^x.

Example 1 : ln(2) = 0.69314718 so e^0.69314718 = 2
Example 2: log(2) = 0.301029995 so 10^0.30102995 = 2

Oct 02, 2011 | Casio FX-115ES Scientific Calculator

### How do i input log base 10 it into my calc?so that i can calculate power inputs and outputs

Use the "log" key in the third row of the keyboard. This is for the common (base 10) logarithm. The "ln" key next to is for the natural (base-e) logarithm.

Mar 29, 2011 | Casio FX-300MS Calculator

### What does the subscript between "log" and the

That's the base for the logarithm. Logarithms are usually taken with base 10 (common logarithms, LOG on the calculator) or with base e (natural logarithms, LN on the calculator), but sometimes other bases are used.

Feb 22, 2011 | Texas Instruments TI-83 Plus Calculator

### How to enter logarithms in to a ti-83 plus. I know where the log button is but i cant figure out how to put in the base of the log or anything after that. Trying to graph a log.

The TI-83+ has keys for natural and common logarithms (base e and 10, LN and LOG, respectively). If you want to calculate the logarithm to another base, you have to use the relationship

LOGb(x) = LOG(x)/LOG(b) = LN(x)/LN(b)

Apr 10, 2010 | Texas Instruments TI-83 Plus Calculator

### How to enter a different log base (other than base e or base 10) into the Texas Instrument TI-80 silver

You cannot. You must use the formula
log_b(a)=ln(a)/ln(b)
where log(a) is common logarithm of a and ln(a)= natural logarithm of a

If you had the TI84PLUS or TI84PLUS SE, you could have installed the newest OS upgrade and that upgrade uses math print which allows the user to calculate logarithms in any base directly.

Mar 22, 2010 | Texas Instruments TI-83 Plus Calculator

### Random based logarithms

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, )

Apr 03, 2009 | Texas Instruments TI-83 Plus Calculator

### Logarithmic functions

All calculators it's the same:
log x base y = log x / log y
log (x*y) = log x + log y
log (x/y) = log x - log y
the default base in all the calculators is 10 so instead of writing log 4 base 2 you simply need to write log 4 / log 2
Hope you understand :)

Dec 16, 2008 | Casio FX-7400G Plus Calculator

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