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Math Help - What is the domain & range of function?

  1. #1
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    What is the domain & range of function?

    f(x)=x^2+4x+9

    Domain:
    Range:

    Thank you
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  2. #2
    MHF Contributor
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    Important question: Do you know what the domain and range of a function are in general?

    edit: I see you are still online looking at this thread. I can help you, I just wanted a simple answer first.
    Last edited by Jameson; November 3rd 2008 at 05:57 PM.
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  3. #3
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    Yes I do

    Domain:any value of x that this function won't work on?

    Range: minimum y value? Then anything less
    than that is out of this function's range.

    But I don't know how to apply this in brackets with infinities???
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