Question about Texas Instruments TI-83 Plus Calculator

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Use the logBASE function available in the MATH menu. Press MATH, use cursor-left/right to select the MATH submenu, then use cursor-up/down to access logBASE.

Posted on Jun 08, 2014

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Posted on Jan 02, 2017

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Use the formula

log in base b of (a) =**log_b(a)=log(a)/log(b)=ln(a)/ln(b)**

log in base b of (a) =

Apr 06, 2015 | Casio Office Equipment & Supplies

I calculators __you can't__ change or set the base of 'log' is __default 10__ so you need to know these:

log x (base y) = log x / log y

when log x it's automatic log x (base 10) here some examples:

log 8 (base 2) = log 8 / log 2

log 27 (base 3) = log 27 / log 3

and the base it's default 10 again, and that is how you need to use it in calculators(no bases), and here the explanation to this:

log x (base y) = log x (base 10) / log y (base 10) = (log x / log 10) / (log y / log 10) = (log x / log 10) * (log 10 / log y) = log x / log y

here so other stuff about 'log' :

log (x*y) = log x + log y

log (x/y) = log x - log y

Hope it's helped**☺**

log x (base y) = log x / log y

when log x it's automatic log x (base 10) here some examples:

log 8 (base 2) = log 8 / log 2

log 27 (base 3) = log 27 / log 3

and the base it's default 10 again, and that is how you need to use it in calculators(no bases), and here the explanation to this:

log x (base y) = log x (base 10) / log y (base 10) = (log x / log 10) / (log y / log 10) = (log x / log 10) * (log 10 / log y) = log x / log y

here so other stuff about 'log' :

log (x*y) = log x + log y

log (x/y) = log x - log y

Hope it's helped

on Jul 07, 2009 | Casio fx-300ES Calculator

Calculate the log (base 10) of the number, then divide the result by the log (base 10) of the base.

For example, to calculate the base-3 log of 9, calculate the log of 9 to get 0.954 . Divide that by the log of 3 (about 0.477) to get 2.0 .

Since 9 is 3 squared, the log base 3 of 9 is 2, as we just calculated.

For example, to calculate the base-3 log of 9, calculate the log of 9 to get 0.954 . Divide that by the log of 3 (about 0.477) to get 2.0 .

Since 9 is 3 squared, the log base 3 of 9 is 2, as we just calculated.

Mar 28, 2012 | Office Equipment & Supplies

Most calculators can't do logs in different bases, but you can solve for the answer this way:

Let's say you need to take the log of 5 in base 3. This can also be written as log5 (base 10)/log3 (base 10).

A more technical solution can be found here: http://oakroadsystems.com/math/loglaws.htm#NewBase

Let's say you need to take the log of 5 in base 3. This can also be written as log5 (base 10)/log3 (base 10).

A more technical solution can be found here: http://oakroadsystems.com/math/loglaws.htm#NewBase

May 25, 2011 | Casio FX-9750GPlus Calculator

The TI-83 doesn't have such a function built-in. Use the relationship logb(x) = log(x)/log(b) = ln(x)/ln(b).

May 13, 2010 | Texas Instruments TI-83 Plus Calculator

You cannot. You must use the formula

log in base b of a =log(a)/log(b) or

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.

log in base b of a =log(a)/log(b) or

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

Hello,

There is something missing in the formulation.

Any way you cannot calculate it directly on this calculator.You need to use the formula

**log_5 (a)= ln(a) x log_5 (e) **a is a positive integer

where** log_5** means log in base 5 (my notation for the function)

**e** is the base of the natural logarithms (e=2.71928 )

**ln** is the natural log function

To obtain a more accurate value of e, calculate e^(1)

Here are some values of log(e) in different bases (for you to play with)

log_2(e)= 1.442695041

log_3(e)=0.9102392266

log_4(e)=0.7213475204

log_5(e)=0.6213349346

log_6(e)=0.5581106266

log_7(e)=0.5138983424

log_8(e)=0.4808983470

log_9(e)=0.4551196133

log_10(e)=log(e)=0.4342944819

If you have to use log in bases other than 10 or e, you will need a claculator that does that at the touch of a button. Some calculators that handle these calculations are the Casio FX-300ES, FX-115ES,FX-991ES, those called Natural Display, or WriteView(Sharp) or Textbook display.

Hope it helps.

There is something missing in the formulation.

Any way you cannot calculate it directly on this calculator.You need to use the formula

where

To obtain a more accurate value of e, calculate e^(1)

Here are some values of log(e) in different bases (for you to play with)

log_2(e)= 1.442695041

log_3(e)=0.9102392266

log_4(e)=0.7213475204

log_5(e)=0.6213349346

log_6(e)=0.5581106266

log_7(e)=0.5138983424

log_8(e)=0.4808983470

log_9(e)=0.4551196133

log_10(e)=log(e)=0.4342944819

If you have to use log in bases other than 10 or e, you will need a claculator that does that at the touch of a button. Some calculators that handle these calculations are the Casio FX-300ES, FX-115ES,FX-991ES, those called Natural Display, or WriteView(Sharp) or Textbook display.

Hope it helps.

Sep 03, 2009 | Texas Instruments TI-30XA Calculator

It's simple 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

you just need to know that the default base of log in calculators is 10, so log x mean

log x base 10 = log x / log 10,

so write log x / log y for log x base y example:

log 8 base 2 = log 8 / log 2 that is how you write it on calculator, hope it was helpful

log x base y = log x / log y

log (x*y) = log x + log y

log (x/y) = log x - log y

you just need to know that the default base of log in calculators is 10, so log x mean

log x base 10 = log x / log 10,

so write log x / log y for log x base y example:

log 8 base 2 = log 8 / log 2 that is how you write it on calculator, hope it was helpful

Jul 01, 2009 | Texas Instruments TI-83 Plus Calculator

Like you maybe know in math (I know!) log x base y = log x / log y

so what you need its just input your number (x for example) and log it, than divide log x by log 2.

just: log x / log 2. (by the way in calculator the meaning of log x is log x base 10 the default base is 10)

so what you need its just input your number (x for example) and log it, than divide log x by log 2.

just: log x / log 2. (by the way in calculator the meaning of log x is log x base 10 the default base is 10)

Jun 05, 2009 | Casio FX-300MS Calculator

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

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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