Homework Help: Pre Cal/Logarithism

Posted by Angela on Sunday, July 24, 2011 at 9:39pm.

given that f(x)=11^x, find x when f(x)=7
a) x=Ln(7/11)
b) x=Ln7/Ln11
c) x= 7/11
d) x= ll sub 7 11

Pre Cal/Logarithism - Reiny, Sunday, July 24, 2011 at 9:43pm
so you solving:
11^x = 7
take ln of both sides

ln(11^x) = ln7
x(ln11) = ln7
x = ln7/ln11

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