Friday, October 15, 2010

Solve for x: log(2) x = log(8) 256

For any system of logarithms we can use the relation: log
(a) b = log(x) a / log(x) b where x can be any positive number to be use as the
base.


Now using x= 2,


log (8)
256 = log(2) 256 / log(2) 8.


But we know that log(2) 8
=3


Also log (2) 256 = 8


So
log(2) 256 / log(2) 8 = 8/3


Or log(2) x =
8/3


Raising both sides to the power 2, we
get


x =
2^(8/3)


Therefore x =
2^(8/3)

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