Solving Polynomial Functions: Find x in 0<|x|≤1/2

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SUMMARY

The discussion focuses on solving the polynomial function defined by f:ℝ→ℝ, specifically finding x such that 0 < sqrt(x^2 + 1) - |x| ≤ 1. The user attempted to derive the inverse function f^-1(]0,1]) but concluded that their solution, 0 < |x| ≤ 1/2, was incorrect. The conversation emphasizes the need for a more rigorous approach to solving inequalities involving absolute values and square roots.

PREREQUISITES
  • Understanding of polynomial functions and their properties
  • Knowledge of absolute value functions
  • Familiarity with square root functions
  • Basic skills in solving inequalities
NEXT STEPS
  • Study the properties of absolute value functions in detail
  • Learn techniques for solving inequalities involving square roots
  • Explore inverse functions and their applications in calculus
  • Practice solving similar polynomial equations and inequalities
USEFUL FOR

Students studying calculus, particularly those focusing on polynomial functions and inequalities, as well as educators seeking to enhance their teaching methods in these areas.

mtayab1994
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Homework Statement



f:ℝ→ℝ
x:→sqrt(x^2+1)-lxl

Homework Equations



calculate f^-1(]0,1])

The Attempt at a Solution



well i chose a y from ]0,1] and tried to find an x that solves the problem like the following.

0<sqrt(x^2+1)-lxl≤1

at the end i got the following: 0<lxl≤1/2 is my work correct?
 
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No it is not correct. What is your work??
 

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