Question about Texas Instruments TI-84 Plus Calculator

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Posted on Jan 02, 2017

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SOURCE: How do i calculate the log to a specific Base?

If you have the latest version of the firmware (2.53) you can use the logBASE function available in the CATALOG. If you don't have the latest firmware, you can get it from http://education.ti.com

Regardless of the firmware version, you can always compute the logarithm to any base by using the relationship

logb(x) = log(x)/log(b) = ln(x)/ln(b)

Posted on May 02, 2010

Testimonial: *"Perfect answer!"*

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Press LOG 3 ENTER.

The LOG key on the keyboard gives you base-10 (common) logs while the LN key gives you base-e (natural) logs. If you want the log to another base you can use the logBASE function found in the catalog.

The LOG key on the keyboard gives you base-10 (common) logs while the LN key gives you base-e (natural) logs. If you want the log to another base you can use the logBASE function found in the catalog.

Apr 07, 2014 | Texas Instruments TI-84 Plus Calculator

http://education.ti.com/guidebooks/scientific/30xii/teacher_guide/30xiitg-eng_.pdf page 108 may shed light on this. This may not be your exact model but the keys work the same.

Nov 29, 2013 | Texas Instruments Ti 30x Iis Scientific...

To calculate the common log ( LOG base 10) of a positive number, just press the LOG key, the one above the blue Division key, then enter the number and close the right parenthesis. Press the ENTER key to get the result.

If you want to calculate the log in a base other than e (natural) or 10 (decimal) logarithms, you need to make use of one of the equivalent formulas below

log in base a of a number b

log_a(b)=log_10(b) / [ log_10(a)] or

log_a(b)= ln(b)/ln(a)

If you want to calculate the log in a base other than e (natural) or 10 (decimal) logarithms, you need to make use of one of the equivalent formulas below

log in base a of a number b

log_a(b)=log_10(b) / [ log_10(a)] or

log_a(b)= ln(b)/ln(a)

Apr 19, 2011 | HP 39g Calculator

To calculate the log base 2 of a value, calculate its log and then divide by the log of 2. You can use either the log or the ln keys, but be consistent. For example, to calculate the log base 2 of 16, you can calculate either log(16)/log(2) or ln(16)/ln(2).

Nov 27, 2010 | Casio FX570MS Scientific Calculator

Yes, there is a [LOG] key to calculate decimal logarithms (logs in base 10) it is marked LOG, and another key marked [LN] to calculate the natural logarithms (logs in base e).

You enter a positive number, then press the appropriate log key (LOG or LN) and the result will be displayed.

You enter a positive number, then press the appropriate log key (LOG or LN) and the result will be displayed.

Jul 25, 2010 | Texas Instruments TI-30XA Calculator

If you have the latest version of the firmware (2.53) you can use the logBASE function available in the CATALOG. If you don't have the latest firmware, you can get it from http://education.ti.com

Regardless of the firmware version, you can always compute the logarithm to any base by using the relationship

logb(x) = log(x)/log(b) = ln(x)/ln(b)

Regardless of the firmware version, you can always compute the logarithm to any base by using the relationship

logb(x) = log(x)/log(b) = ln(x)/ln(b)

May 02, 2010 | Texas Instruments TI-83 Plus Calculator

Hi,

Your calculator cannot compute directly the logarithms in an arbitrary base, but you have the means to obtain that indirectly.

You can use either of the conversion formulas shown on the screen capture (on the right). On screen capture ln stands for natural logarithm.

If you want binary logarithms (logs in base 2) you use the relation

**log_2 (x) =ln(x)/ln(2)**

or

**log_2(x)=log(x)/log(2)**

Use whichever formula is shorter to key in (without pressing the 2nd key).

Hope it helps.

Your calculator cannot compute directly the logarithms in an arbitrary base, but you have the means to obtain that indirectly.

You can use either of the conversion formulas shown on the screen capture (on the right). On screen capture ln stands for natural logarithm.

If you want binary logarithms (logs in base 2) you use the relation

or

Use whichever formula is shorter to key in (without pressing the 2nd key).

Hope it helps.

Nov 16, 2009 | Texas Instruments TI-86 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

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

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

Hello,
The first remark is this.
The ratio log(0.8)/log(2) is by definition binary log of 0.8 ( meanibg log in base 2 of 0.8)
The second remark is good news for you.: When in MathIO, [SHIFT][MODE][1:MathI0], your calculator can compute directly the log in any base of any number.
To use the functionality, you press the key below [ON]. It is a log symbols with a small solid square, and and erect empty rectangle.

When you press the key the screen shos a template. In the smaller and lowered square goes the base (here 2). When you enter the base, press the right arrow to move cursor to the rectangle inside the parentheses and type in 0.8. Use the right arrow to move the cursor out of the parentheses.

Practice: try that. the result should be -0.321928095. Good. Now use the replay button to move cursor to the command line outside the right parenthesis. I am going to give you the other key stokes. Let**log(2,0.8) be my representation for log in base2 of 0.8.** Then you enter the rest of the calculation as

**log(2, 0.8) [*] [ ( ] [(-)] 0.321 [ ) ] [*] 2500 [=] **

Here [*] is the multiplication sign [(-)] is the negation (change sign), just above the [RCL] key.

[ ( ] is the left parenthesis and [ ) ] its matching right parenthesis. Both of them enclose the number -0.321. It underlined them for clarity.

The result should be 259.0716344

If you do not like what I did above, you can always do things the old way. You use the log key just above the [COS] key. In that case -0.3219*[LOG] (0.80)/[LOG] 2 * 2500. Do not to supply the ) for both log. The calculator inserts the left ones by default.

Hope it helps.

When you press the key the screen shos a template. In the smaller and lowered square goes the base (here 2). When you enter the base, press the right arrow to move cursor to the rectangle inside the parentheses and type in 0.8. Use the right arrow to move the cursor out of the parentheses.

Practice: try that. the result should be -0.321928095. Good. Now use the replay button to move cursor to the command line outside the right parenthesis. I am going to give you the other key stokes. Let

Here [*] is the multiplication sign [(-)] is the negation (change sign), just above the [RCL] key.

[ ( ] is the left parenthesis and [ ) ] its matching right parenthesis. Both of them enclose the number -0.321. It underlined them for clarity.

The result should be 259.0716344

If you do not like what I did above, you can always do things the old way. You use the log key just above the [COS] key. In that case -0.3219*[LOG] (0.80)/[LOG] 2 * 2500. Do not to supply the ) for both log. The calculator inserts the left ones by default.

Hope it helps.

Dec 03, 2008 | Casio fx-300ES Calculator

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