volume help!

bard

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...

NateTG

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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bard	volume help! Tweet 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...

NateTG Recognitions: Homework Help Science Advisor	It might help you if you make a drawing -- draw the line that you're rotating about, and the region that is being rotated.