Now that you know what \({\log _a}x\) means, you should know and be able to use the following results, known as the laws of logarithms.

These are marked log and ln. The log key is used for calculations of the form \({\log _{10}}x\). For example, to work out that \(\log 10000 = 4\) you would press \(\log 10000 =\) Using this method ...