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Thread: domain of a function

  1. October 25th 2009, 02:56 AM #1
    yen yen
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    domain of a function

    f(x;y) = 1/ (9x^2 + y^2)

    what is the domain of this function? i know that 9x^2 + y^2 cannot be equals to 0 so where do i go from there?
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  2. October 25th 2009, 03:00 AM #2
    mr fantastic
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    Quote Originally Posted by yen yen View Post
    f(x;y) = 1/ (9x^2 + y^2)

    what is the domain of this function? i know that 9x^2 + y^2 cannot be equals to 0 so where do i go from there?
    The domain is the set of all ordered pairs (x, y) where x \in R\{0} and y \in R\{0}.
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  3. October 25th 2009, 04:19 AM #3
    Raoh
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    hi
    9x^{2}+y^{2} cannot equal zero only when x and y aren't equal to zero.
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