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How do you enter a logarithmic equation into my calculator?

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  • kakima Nov 13, 2010

    What make and model?

  • doublecfarm Nov 17, 2010

    It is a TI-30X IIS from Texas Instruments.



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The 30XIIS does not have the capability of solving equations. It can, however, calculate expressions using logarithms. Use the LOG key for common logarithms and the LN key for natural logarithms. In both cases, press the function key, enter the value or expression, and then ) to match the ( the function automatically enters.

The LOG and LN keys are the second and third keys from the top in the leftmost column of the keyboard.

Posted on Nov 17, 2010



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The integral cannot be calculated in terms of the elementary functions. It is given by dilogarithm Li_2. Note here that log stands for the natural logarithm (ln)


Jan 01, 2014 | Texas Instruments TI-89 Calculator

1 Answer

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

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What are the keystrokes to input logarithmic functions? log(base 4) 1/4 = the answer I am looking for How would one, if possible input this equation?

You press [alpha] then [f3] to open the func menu. Use the arrow keys to highlight logbase( and press enter.
then type in the value , base). Keystrokes would be [alpha] [f3] arrow and select logbase( , then [1] [(divide)
[4] [,] [4] [)] [=] . (your screen should look like logbase(1/4 , 4) = -1.

Mar 04, 2011 | Texas Instruments TI-85 Calculator

1 Answer

How do I enter in equations with logarithms that have bases other than 10 or e?

If you want to take the log of X using base B, where B is an arbitrary number, use the following equation:

logB(X) = log10(X) / log10(B)

In words this is the log base B of X equals the log base 10 of X divided by the log base 10 of B. This equation can now be solved using your calculator.

I hope this helps you out.

Feb 09, 2011 | Vacuums

2 Answers

How do I find logarithms on the ti89?

For natural logarithms, you can use the ln function (2ND shift of the X key). For example, the natural logarithm of 3 is 2ND [LN] 3 ) ENTER.

For logarithms to other bases, use the log function (diamond shift of the 7 key). For example, the base-2 logarithm of 16 is diamond 7 1 6 , 2 ) ENTER. If the base is 10 (common logarithms), you can omit the comma and the second argument.

Apr 28, 2010 | Texas Instruments TI-89 Calculator

1 Answer

How can i get logarithms on the calculator

For natural logarithms Press [2nd][X], enter a positive number, close the right parenthesis and press [ENTER]. If the number is decimal the result is displayed as a number. If the number is integer, put a decimal mark at its end to have the result displayed as decimal.

For decimal logarithms use the ALPHA keyboard to enter the log( command, complete the argument and press ENTER

If you want to calculate log in base a of number b type log(b,a).

Apr 13, 2010 | Texas Instruments TI-89 Calculator

2 Answers

How to use the Logerithmic function on this calculator


Logarithms in base 10 :Common logarithms
  1. The calculator has a key labeled [LOG]. It allows you to calculate the common logarithms (logarithms in base 10).
  2. To calculate the common logarithm of a (positive) number you type in the number, press the [LOG] key .
  3. Ex: 15.32 [LOG][=] gives 1.1852558765
Logarithms in base e : Natural logarithms
  1. The calculator has a key labeled [LN]. It allows you to calculate the natural logarithms of positive numbers.
  2. Ex: natural log of 15.32 is entered as
  3. 15.32 [LN] gives 2.729159164
Hope it helps.
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Nov 23, 2009 | Texas Instruments TI-36 X Solar Calculator

1 Answer

Which keys do i use to put in a logarithmic equation on a Casio fx-300MS?

For logarithms one uses one of two keys
  1. [LOG] for logarithms in base 10. It is in the same column as the F1 key, on 4th row
  2. [LN] for natural logarithms. It is in the same column as the F2 key, fourth row, to the right of the [LOG] key.
No, that is not right. This is for the FX-7400G (as specified in heading). Well too bad. The information is still valid, except for the location on the keypad. That should not be too difficult to find on the FX-300MS keypad.

Jul 25, 2009 | Casio FX-7400G Plus Calculator

1 Answer

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

1 Answer

Exponential and logarithmic equations

You re-asked this question more clearly and I answered it.....

Dec 14, 2008 | Texas Instruments TI-30XA Calculator

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