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Pre-calc function

  1. Sep 25, 2005 #1
    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!? :confused:
  2. jcsd
  3. Sep 25, 2005 #2

    Tom Mattson

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    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?
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