mrusciolelli1678 mrusciolelli1678
  • 07-02-2020
  • Mathematics
contestada

Find the volume of the solid obtained by rotating the region enclosed by y=1x2,y=0,x=1, and x=8, about the line y=−3 using the method of disks or washers.

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LammettHash
LammettHash LammettHash
  • 07-02-2020

I assume the first equation is [tex]y=\frac1{x^2}[/tex]. Using the method of washers, the volume is

[tex]\displaystyle\pi\int_1^8\left(\frac1{x^2}+3\right)^2-3^2\,\mathrm dx=\pi\int_1^8\frac1{x^4}+\frac6{x^2}\,\mathrm dx=\boxed{\frac{8575\pi}{1536}}[/tex]

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