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Math Help - Help with two functions...

  1. #1
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    Help with two functions...

    f(x)= x/2-x and g(x)=1/x

    domain f o g



    Any help with this question would be much appreciated. Thank you!
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  2. #2
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    Re: Help with two functions...

    Quote Originally Posted by curt26 View Post
    f(x)= x/2-x and g(x)=1/x

    domain f o g



    Any help with this question would be much appreciated. Thank you!
    Is the question is asking for the domain of fg?

    If so, then the answer is the domain of the function g(x) which has to be provided in the question.
    Last edited by Punch; March 18th 2013 at 09:52 PM.
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  3. #3
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    Re: Help with two functions...

    Quote Originally Posted by curt26 View Post
    f(x)= x/2-x and g(x)=1/x

    domain f o g



    Any help with this question would be much appreciated. Thank you!
    f \circ g=f(g(x))=\frac{\frac{1}{x}}{2-\frac{1}{x}}=\frac{1}{2x-1}

    Domain : \forall x \in \mathbb{R} ~\text{except}~ x=\frac{1}{2} ~\text{and}~x=0
    Last edited by princeps; March 18th 2013 at 09:56 PM.
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  4. #4
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    Re: Help with two functions...

    x/2-x or x/(2-x) ?
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