Desperately Need Help!

Reply Mon 30 Sep, 2013 08:12 am
Compute the surface area generated by revolving the curve f(x)=2√x, 1<= x <=4, about the x axis. Need detailed solution!
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Reply Mon 30 Sep, 2013 11:04 am
Reply Mon 30 Sep, 2013 12:19 pm
Thank you, though I am aware of the technique. I am having trouble evaluating the integral sqrt(1 +1/x). I need to know how to evaluate this integral to solve surface area of rotation.
Reply Mon 30 Sep, 2013 03:21 pm
Read the formula at fresco's link again.

Your integrand seems to be missing a factor of 2π*y.
Reply Mon 30 Sep, 2013 07:34 pm
You seem to be misunderstanding the difficult part of the problem. The 2pi is not the problem. Constants get pulled out. I need help evaluating remaining integral. I need help with finding the appropriate integration technique for sqrt(1+(1/x))
Reply Mon 30 Sep, 2013 08:15 pm
ameliajean wrote:

Constants get pulled out.

y isn't a constant.
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