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December 21, 2014

December 21, 2014

Posted by **david** on Tuesday, January 9, 2007 at 12:25am.

by using the shell method, i got

v=2*pi int(o to 1) (x)(e^x) dx

and my teacher said the answer is e/2 but i keep getting a different answer

Are you sure it is to be rotated about the y axis?

Your attempt ends in dx suggesting you are rotating about the x axis.

It would be a relatively easy question if it is rotated about the x axis, but if you rotate about the y axis that would involve the integral of Pi*(ln y)^2 dy from 1 to e

let me know which way it is before I do that difficult question.

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