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Homework Help: Find area using integral

  1. Mar 12, 2012 #1
    concrete sections for a new building have the dimensions in meters and shapw shown in the figure.

    a)find the area of the face of the section superimposed on the rectangular coordinate system.

    The way i tried to solve this was to split it up into 2 integrals and add them together to get the area

    the integrals were

    integral from -5.5 to 0 of 1/3*sqrt(5+x)dx + integral from 0 to 5.5 of 1/3*sqrt(5-x)dx

    I tried the first part and got

    2/9*(5+x)^(3/2) but when you evaluate it at -5.5 you end up taking the squareroot of a negative number.

    Did i do it completely wrong? or did i just make a simple mistake?

    any help would be appreciated.

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  2. jcsd
  3. Mar 12, 2012 #2
    figured it out, couldnt figure out how to delete a post though.
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