Question about Casio FX-260 Calculator
Use the log function (common logarithm). See screen capture for markings
To evaluate the negative of a logarithm
Enter the number (argument) of the logarithm
Press the = key to have it calculated.
While result is still displayed, press the sign change key or (+/-).
Beware that -log(number) is not necessarily a negative value.
Another way to calculate -log is to use the relation
3 [EXP] [(] [+/-] 2 [) ] [LOG][=] [+/-]
[EXP] is the key to enter exponent of a power of 10 :It is a shortcut, so no 10 is entered. Respect the key sequence above.
[ (] left parenthesis to prevent ambiguity due to the negaticve exponent. Just a security.
[)] is the enclosing right parenthesis
[+/-] is the Sign Change key
Posted on Jun 22, 2010
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Posted on Jan 02, 2017
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