does any1 have an ideas as when to use log in a question.???
To solve for exponents.
For example:
$\displaystyle
10^x = 100$
Take the log of both sides:
$\displaystyle
\log {10^x} = \log {100}$
Using laws of logarithms we have:
$\displaystyle x\cdot \log {10} = \log {100}$
Then simply calculate the logs and solve for x:
$\displaystyle x = 2$