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Math Help - Domain and Range

  1. #1
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    Domain and Range

    Had my first calc test today!
    I feel pretty good about it.
    One question...

    y = 2/ sqrt(x-3)

    find domain and range...

    Can someone tell me what it is... I hope I did it right.
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  2. #2
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     x \in (3,\infty)

     y \in \mathbb{R} /{0}
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  3. #3
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    Quote Originally Posted by pickslides View Post
     x \in (3,\infty)

     y \in \mathbb{R} /{0}
    Shouldn't  y be greater than zero?
    Last edited by mr fantastic; September 18th 2009 at 09:11 AM. Reason: Restored original reply
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  4. #4
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    Given the range of the function is the domain of the inverse then y can be negative

    f(x)= \frac{2}{\sqrt{x-3}}

     f^{-1}(x) = \frac{4}{x^2}+3
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