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Math Help - multiple choice question

  1. #1
    Junior Member ibnashraf's Avatar
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    multiple choice question

    If \frac{16^x}{\frac{1}{2} x^2}-32=0, then x=

    (a) -1 or -4

    (b) 1 or -5

    (c) 2 or -4

    (d) -2 or 4
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  2. #2
    Super Member bigwave's Avatar
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    Quote Originally Posted by ibnashraf View Post
    If \frac{16^x}{\frac{1}{2} x^2}-32=0, then x=

    (a) -1 or -4

    (b) 1 or -5

    (c) 2 or -4

    (d) -2 or 4

    I can only get

    x = 1

    which is not one of the choices
    Last edited by bigwave; December 9th 2009 at 03:03 PM. Reason: latex
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  3. #3
    MHF Contributor
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    I would advise graphing this equation and seeing where they cross the x axis.

    Equivalently, you could graph

    y = 16^x and 16x^2 and see where they intersect.
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  4. #4
    Junior Member ibnashraf's Avatar
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    actually that's how i interpreted the question to be since it wasn't clearly written. This is exactly how i saw it written down:

    16^x/\frac{1}{2}x^2-32=0

    So is there any way that the above question can be "interpreted" to give one of the 4 responses mentioned previously?
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  5. #5
    Super Member bigwave's Avatar
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    Talking

    as Prove IT suggested to graph it

    did graph this and none of answers showed except x = 1 is the only interger value

    and got 1/2

    its a strange multiple choice
    Last edited by bigwave; December 9th 2009 at 03:57 PM. Reason: wording
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  6. #6
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    Quote Originally Posted by ibnashraf View Post
    actually that's how i interpreted the question to be since it wasn't clearly written. This is exactly how i saw it written down:

    16^x/\frac{1}{2}x^2-32=0

    So is there any way that the above question can be "interpreted" to give one of the 4 responses mentioned previously?
    The only answers I can see are 1 and 1/2. Putting it into Maple confirms, as well as another way funky answer. None of these are of course a choice. Something tells me the problem might be written down wrong?
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