Hi everyone, I really don't know how to solve this problem. Please help me or give me some ideas to solve it. Thank you very much.

Given f(x) = 2x + ln x. Suppose f(x) has the inverse f^-1(x) on D=[1,infinity). Find f^-1(2)

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- Feb 17th 2014, 05:40 AMmath88The inverse of f(x)
Hi everyone, I really don't know how to solve this problem. Please help me or give me some ideas to solve it. Thank you very much.

Given f(x) = 2x + ln x. Suppose f(x) has the inverse f^-1(x) on D=[1,infinity). Find f^-1(2) - Feb 17th 2014, 05:49 AMProve ItRe: The inverse of f(x)
First of all, is the function one to one on the domain given? This is necessary to ensure that the inverse is a function.

Then to find the inverse, swap the x and y and solve to get y = ... - Feb 17th 2014, 06:09 AMPlatoRe: The inverse of f(x)
- Feb 17th 2014, 07:01 AMmath88Re: The inverse of f(x)
I don't understand why f(x)=2=2x+ln(x)

I can't find the inverse of f(x) because I can't solve for x (x=g(y)). - Feb 17th 2014, 07:14 AMPlatoRe: The inverse of f(x)