Tip & How-To about Casio fx-300ES Calculator

The Log function!!

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

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2 Answers

I need help with a change of base formula problem.


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

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

1 Answer

how to calculate logarithm values with different base


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)

Jun 05, 2009 | Casio FX-300MS Calculator

2 Answers

Log function on casio fx-9750GA Plus


Look it's simple in the calculator the default base is 10 so when you input log 3 its log 3 base 10 so:
maybe you know in math log x base y = log x / log y . So if you need log 3 base 3 its => log 3 / log 3 (by the way its 1)

Mar 27, 2009 | Casio FX-300MS Calculator

1 Answer

find log(1-.2)


I don't get it but here some help with logs:
log x base y = log x / log y (when log x is default base 10 in calculators) and
log (x*y) = log x + log y
log (x/y) = log x - log y
the bases is default 10
hope it's helped

Feb 05, 2009 | Casio FX-300MS Calculator

1 Answer

Can't chang the logbase


It's 2*3=6 but about the base, you can't change it in the calculators the default base it's 10 so log x it's Logbase 10^x 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
in your example log 9 base 3 = log 9 / log 3 etc.
hope you get it, and it was helpful

Nov 12, 2008 | Texas Instruments TI-89 Calculator

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