Posted by bob on Friday, January 23, 2009 at 3:04pm.
1/4^x = 8
4^x = 1/8
x log4 (4) = log4 (1/8)
but log4 (4) = 1 because b^logb(a) = a
x = log4(1/8) = log4(1) - log4(8)
but log4(1) = 0 for the same reason
so
x = -log4(8) or -x = log4 (8)
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