SOLUTION: find the inverse of f(x)=2^x+1

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Question 1013136: find the inverse of f(x)=2^x+1
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Okay, from
f(x)=2^x+1
y = 2^x + 1
x = 2^y + 1
x - 1 = 2^y
log(x-1) = log 2^y
log(x-1) = y log 2
y = log(x-1) / log 2
f^(-1)(x) = log(x-1) / log 2