1. Sep 25, 2005 #1

   litz

   

   i was wondering, it says use interval notation to describe the domain of the real function, but a real function means the domain is a set of real numbers. does it mean all real numbers? i graphed it on my calculator and got [-9,10] but i have no idea if i should have negative infinity to positive infinity for all real numbers??
   
   f(x)=square root of (x squared -3x+2). whats the domain!?

    

   litz, Sep 25, 2005
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3. Sep 25, 2005 #2

   Tom Mattson

   

   Staff Emeritus

   Science Advisor

   Gold Member

   Start small. Consider the function [itex]f(x)=\sqrt{x}[/itex]. If the function is to be real-valued, then what sort of numbers aren't we allowed to put in for x?

    

   Tom Mattson, Sep 25, 2005

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