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Homework Help: Volume help!

  1. Dec 6, 2005 #1
    Find the region enclosed by x=3y and x=-y^2+4. Set up integrals both shell and disc that represent the volume when this region is revolved about y=4.

    i got the shell method, how would i represent the disc method>

    pi integral(-4,1) (3y-4)^2-(-y^2)^2 --this is wat i got for disc method, though i am sure it is wrong...
  2. jcsd
  3. Dec 7, 2005 #2


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    It might help you if you make a drawing -- draw the line that you're rotating about, and the region that is being rotated.
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