Functions: Introduction to functions
              The range of a function
  The range of a function 
                    
    The range of the function #f# defined by #f(x) = -{{4}\over{x+1}}#  on all real numbers except #-1# (that is, having domain #{\mathbb R}\setminus\{-1\}#) consists of all real numbers, except one. Which one?
                        
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