Finding the domain of the inverse function

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SUMMARY

The discussion centers on determining the domain of the inverse function for f(x) = e^(-x) - x, where x is a real number. The conclusion reached is that the domain of the inverse function is all real numbers (R), as the range of f also spans all real numbers. The participant initially questioned the validity of combining inequalities but later confirmed the correctness of their solution after reevaluating the function.

PREREQUISITES
  • Understanding of inverse functions
  • Knowledge of exponential functions, specifically e^(-x)
  • Familiarity with inequalities and their manipulation
  • Basic concepts of function range and domain
NEXT STEPS
  • Study the properties of inverse functions in detail
  • Explore the behavior of exponential functions, particularly e^(-x)
  • Learn about the implications of domain and range in function analysis
  • Investigate methods for solving inequalities involving exponential functions
USEFUL FOR

Students studying calculus, particularly those focusing on functions and their inverses, as well as educators seeking to clarify concepts related to exponential functions and their properties.

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Homework Statement



Let f(x)=e^(-x)-x ,, x belongs to R

Find the domain of f inverse


Homework Equations



Domain of f inverse = range of f


The Attempt at a Solution



we have :

-inf < x < inf
-inf < -x < inf ... (1)
0 < e^(-x) < inf ... (2)

By adding (1) and (2) :

-inf < e^(-x) - x < inf

So domain of f = R = range of f inverse.

Is this correct?

Can I add the inequalities together?
 
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Ignore my last post. I read the function wrong. Yep, the domain of the inverse is all real numbers.
 
Thanks.
 

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