Question about Casio FX-115ES Scientific Calculator

# I have a Casio fx-82au plus and want to input logs to the base less than 10. Is there a way to do this? eg log to the base of 2 = 16 (answer is 4 but how do we get that to work on this calculator).

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You can calculate the logarithm to any base by using the relationship
logb(x) = log(x)/log(b) = ln(x)/ln(b).

To calculate the log base 2 of 16, either divide the log of 16 by the log of 2 or the ln of 16 by the ln of 2.

Posted on Apr 07, 2011

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Posted on Jan 02, 2017

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## Related Questions:

### How to calculate inv logs on casio fx-82 au plus?

The inverse of log functions are power functions.
Inv of ln is exponential (e^x)
A function and its inverse usually share the same physical key. One function is accessed directly, the other by using the SHIFT or 2ndF key.

Aug 18, 2014 | Casio Office Equipment & Supplies

### How do I calculate inverse logs on casio fx-82au plus?

The inverse of log functions are power functions.
Inv of ln is exponential (e^x)
A function and its inverse usually share the same physical key. One function is accessed directly, the other by using the SHIFT or 2ndF key.

Aug 18, 2014 | Casio Office Equipment & Supplies

### How do i solve log base 2 times x-10 plus log base 2 times x-3 minus log base 2 times x equals 2

Rephrase the question please. It makes no sense, in particular what are all those TIMES for?
Combine all the logs using the rule log_2(a)+log_2(b)=log_2(a*b)
You get
log_2((x-10)(x-3)/x)=2=log_2(4)
Thus
(x-10)*(x-3)/x=4
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### Casio fx-83GT PLUS gives wrong values for logs

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### How do you convert 4726 to base 10?

4726 seems to already be on base 10
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### How to calculate logarithm values with different base

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

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### Log function on casio fx-9750GA Plus

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### 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 :)

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### How to calculate log value in calculator with different base value

In any scientific calculator log2(n) can be  calculated with either ln or log function as follows

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Or
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both will give nearly the same answers

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