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Math Help - Write Domain and Range in Interval Notation

  1. #1
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    Write Domain and Range in Interval Notation

    f(x) = x - 2/ (x^2 - 4)

    This is what I got:

    D = x is not 2, -2, x is all real numbers
    Range = y is all real numbers

    Are these answers right, and if so how do i write it in notation?

    would the first one be something like

    (-inf, -2) U (-2,2) U (-2, inf)

    and the second one is it: (-inf, inf)
    Last edited by NeedHelp18; October 14th 2008 at 05:38 PM.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by NeedHelp18 View Post
    f(x) = x - 2/ (x^2 - 4)

    This is what I got:

    D = x is not 2, -2, x is all real numbers
    nice (but it won't be all real numbers if x cannot be 2 or -2)

    Range = y is all real numbers
    really? can we touch, say, y = 0, for instance?

    Are these answers right, and if so how do i write it in notation?
    review the range

    would the first one be something like

    (-inf, -2) U (-2,2) U (-2, inf)
    yes

    and the second one is it: (-inf, inf)
    were the second one correct, this would be it, alas, it isn't
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