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Thread: Construction and Solving of Equations

  1. #1
    Junior Member 22upon7's Avatar
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    Construction and Solving of Equations

    This is the sum, I worked it out but got stuck -

    Write down a relevant equation involving the variables defined and solve -

    The Perimeter of aa Square is $\displaystyle (2x+7) cm$. Its Area is $\displaystyle 49 cm^2$

    I worked out an equation and I do get an answer but the answer is negative. The book says the answer should be 10.5 I get -10.5

    Here is the Equation:

    $\displaystyle (\frac{2x+7}{4})^2=49$

    What am I doing wrong?



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  2. #2
    MHF Contributor
    skeeter's Avatar
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    $\displaystyle \left(\frac{2x+7}{4}\right)^2 = 49$

    $\displaystyle \frac{2x+7}{4} = 7$

    $\displaystyle 2x+7 = 28$

    $\displaystyle 2x = 21$

    $\displaystyle x = 10.5$
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