does any1 have an ideas as when to use log in a question.???

Printable View

- Mar 31st 2008, 12:21 PMefthekingLogs
does any1 have an ideas as when to use log in a question.???

- Mar 31st 2008, 12:53 PMtopher0805
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:

$\displaystyle x = 2$