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Math Help - Inequalitites

  1. #1
    Newbie Altami's Avatar
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    Inequalitites

    Hey everybody, I have this inequality that I was wondering if I did right, so if anybody can verify for me please?

    a) \frac{3x-9}{x^2-1}\leq -1

    I got (-\infty, -1)\bigcup(1,3) again if anybody can verify this?

    Never mind I caught a mistake I forgot to get all the numbers to one side and make the inequality equal 0
    Last edited by Altami; July 27th 2010 at 01:48 PM.
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  2. #2
    MHF Contributor

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    That is not even close.
    Solve the following.

    \dfrac{3x-9}{x^2-1}+1\le 0
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  3. #3
    Newbie Altami's Avatar
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    Okay, I corrected the error and now I got

    [-5,-1)\bigcup(1,2]

    is that right?
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  4. #4
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    Yes that is correct.
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  5. #5
    Newbie Altami's Avatar
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    Hey thanks.
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  6. #6
    Newbie Altami's Avatar
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    Okay I really don't want to start another thread so I'll just keep this one but add new questions.

    I am having trouble with this one.

    A right circular cylinder is inscribed within a right circular cone with height 10in and radius of base 3 inches. Find:

    A) The total surface area of the cylinder in terms of the radius of the cylinder.
    Now I know the the equation of the surface area of cylinder is; A=2\pi r^2+2\pi r h but I don't know how to make it in terms of the radius?
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  7. #7
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    Please start a new thread for any new question.
    That is a rule of this forum.
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  8. #8
    Newbie Altami's Avatar
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    Oh, okay.
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