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Math Help - Domain of function

  1. #1
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    Domain of function

    A) 1/(1-e^x)
    B) sqrt(1-8^x)
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  2. #2
    MHF Contributor alexmahone's Avatar
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    Quote Originally Posted by Asuhuman18 View Post
    A) 1/(1-e^x)
    B) sqrt(1-8^x)
    A) \frac{1}{1-e^x}

    The denominator must not equal zero, so x \neq 0.

    B) \sqrt{1-8^x}

    1-8^x\geq0

    1\geq8^x

    x\leq0
    Last edited by alexmahone; October 14th 2009 at 04:13 AM. Reason: Corrected a typo
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  3. #3
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    Quote Originally Posted by alexmahone View Post
    A) \frac{1}{1-e^x}

    The denominator must not equal zero, so x \neq 1. The domain is R-{0}.


    == Most probably there's a little typo here: Alexmahone surely meant 1 - e^x =/= 0 and thus it must be x =/= 0, as he correctly wrote thereafter.

    Tonio


    B) \sqrt{1-8^x}

    1-8^x\geq0

    1\geq8^x

    x\leq0
    ...
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