Posted by Shreya on Wednesday, January 23, 2013 at 8:20pm.
Laws of Logarithms
Evaluate: without using a calculator, except for the first one. The 5.6 is supposed to be subscript, but i don't know how to make it small.
4log(5.6)84
log84/log5.6
Do I multiply this by four or something? both of the logs?

Pre Calculus 12  Reiny, Wednesday, January 23, 2013 at 9:39pm
One major rule of logs, used when changing bases is
log _{b}a
= log a / log b
so 4 log _{5.6}84
= 4(log 84 / log 5.6)
= 4(1.924279.../.74818..) = 10.2877

Pre Calculus 12  Shreya, Wednesday, January 23, 2013 at 10:09pm
Thanks very much Reiny :)
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