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Math Help - Equation Check

  1. #1
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    Equation Check



    Check: x=20
    \frac{5}{16}=\frac{1}{4}

    I think i might have done the check wrong. Since 20 is a solution to this equation. Help please. Thanks.
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  2. #2
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    Re: Equation Check

    Quote Originally Posted by theloser View Post


    Check: x=20
    \frac{5}{16}=\frac{1}{4}

    I think i might have done the check wrong. Since 20 is a solution to this equation. Help please. Thanks.
    Hi theloser,

    You have simplified the right hand side incorrectly. Please check again. I am sure you will be able to catch your mistake.
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  3. #3
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    Re: Equation Check

    Currently I'm not seeing it please helppp.
    Last edited by theloser; July 8th 2011 at 07:21 PM.
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  4. #4
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    Re: Equation Check

    Quote Originally Posted by theloser View Post
    Currently I'm not seeing it please helppp.
    (x + 5) / 4x

    plug in x = 20 you get

    (20 + 5) / 4*20

    Order of operations, so parantheses first

    25 / 4 * 20

    Finish the denominator to get
    25 / 80

    Which simplifies to 0.3125 which equals 5 / 16!
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  5. #5
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    Re: Equation Check

    -1 is another solution to this equation

    \dfrac{5}{-1-4} = \dfrac{-1+5}{4 \cdot -1} \Leftrightarrow \dfrac{5}{-5} = \dfrac{4}{-4} \Leftrightarrow -1 = -1
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