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Homework Help: Finding domain

  1. Nov 6, 2007 #1
    Can someone please tell me why the domain of y=2x^2+12x+12 is x elementof IR
     
  2. jcsd
  3. Nov 6, 2007 #2

    mjsd

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    because the function (of x) is defined for all x in R. It takes any value x in R as a valid input to the function.
     
  4. Nov 6, 2007 #3
    What does IR mean exactly?
     
  5. Nov 6, 2007 #4

    mjsd

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    I don't know... you tell me? :smile: ... judging by the look of it, it looks like
    [tex]\mathbb{R}[/tex]
    which means the real line.
     
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