## FANDOM

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:log(value)


returns the base 10 logarithm of a value. This is the inverse function of 10^(

(84)(89) :log(value,base)


Returns the log of a certain value to a certain base. Note that this only works when you have a calculator with OS 2.53 or higher.

• LOG

## Examples Edit

• $\log{100}$
• The above equation would give you an answer of 2, because 102=100.
• $\log{1}$
• The above equation would give you an answer of 0, because 100=1 (any number to the power of zero is 1).

### Change of BaseEdit

Just because only log10( and ln( are the only log functions on the TI-84 calculator does not mean that those are the only two bases logs can be found for. As per the change of base property of logs, if one wanted to find $\log_2{8}$:

• $\frac{\log{8}}{\log{2}}$
• The above equation would give you an answer of 3, because 23=8, and $\frac{\log{8}}{\log{2}}$ is equivalent to $\log_2{8}$.
• If you prefer, $\log{2}$≈.301 and $\log{8}$≈.903, and $\frac{.903}{.301}$=3