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Math Help - sloving for x

  1. #1
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    sloving for x

    can someone help me solve for x, thanks!

    4.8 = (1.2 + 2x/2)^2/(.30 - x/2)

    i have tried to mult. 4.8 with (.30 - x/2) but doesnt get the correct numbers.
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by jsu03 View Post
    can someone help me solve for x, thanks!

    4.8 = (1.2 + 2x/2)^2/(.30 - x/2)

    i have tried to mult. 4.8 with (.30 - x/2) but doesnt get the correct numbers.
    Hi jsu03,

    Is this your equation?

    4.8=\dfrac{\left(1.2+\dfrac{2x}{2}\right)^2}{\left  (.30-\dfrac{x}{2}\right)}

    That piece where \frac{2x}{2} bothers me. If this is, in fact, your equation, it all boils down to

    x = 0.
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  3. #3
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    Oh no, the 1.2 + 2x is all over 2 : ((1.2 + 2x )/ 2)^2 and so is the
    ((.30 - x)/2)
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  4. #4
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    Quote Originally Posted by jsu03 View Post
    Oh no, the 1.2 + 2x is all over 2 : ((1.2 + 2x )/ 2)^2 and so is the
    ((.30 - x)/2)
    Parentheses are good!

    Okay, your equation is 4.8= \frac{((1.2+ 2x)/2)^2}{.3- x/2}. If you go ahead and multiply boht sides by .3- x/2 as you say, you get 1.44- 2.4x= \left(\fra{1.2+ 2x}{2}\right)^2= \frac{(1.2+ 2x)^2}{4}.

    You might as well go ahead and multiply both sides by 4 as well:
    [tex]5.76- 9.6x= (1.2+ 2x)^2]/math]

    Now multiply out that right side:
    5.76- 9.6x= 1.44+ 4.8x+ 4x^2
    .

    Solve that quadratic equation for x. Don't forget to put the answers back into the origin
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