Posted by fishbowl on Saturday, August 9, 2008 at 11:33am.
Use the rules for changing the base of a logarithm at
http://oakroadsystems.com/math/loglaws.htm#NewBase
It says that
log(a)x = log(b)x/log(b)a
In your case, use it to show that
log(4)9 = log(2)3^2/log(2)4
= 2log(2)3/log(2)4 = log(2)3 !!
Therefore 2log(4)9 = 2 log(2)3
Subtracting 2log(2)3 from that leaves you with log(2)3
The last line should read:
Subtracting log(2)3 from 2log(2)3 leaves you with log(2)3
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