Ln(x) =f(x)

  • Thread starter nunchakula
  • Start date
Just came across this for a program I'm writing. I need to be able to solve an equation of the form ln(x) =f(x) where f isn't a logarithm. specifically, it's ln(x)=-x^2+ a*x+b.

Is this solvable for x or do I need a numeric approximation?
 
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Re: ln(x)=f(x)

Hello.

You must use a numerical approximation to solve this equation.

Bye.
 

CRGreathouse

Science Advisor
Homework Helper
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Re: ln(x)=f(x)

It may be possible with the W-function, but I'd suggest numerical methods (Brent's method or the cosecant method).
 

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