Determine the volum of a solid of revolution when the region bounded by and the straight lines y = 2 and x = 0 are rotated around the line x = 4
my answer(which is wrong)
what am I doing wrong?
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When you rotate about the x-axis (y = 0), you integrate with respect to x.
When you rotate along the line x = 4, you integrate with respect to y.
And can you tell why you picked ?
Hint: Translate your function and all the bounds left 4 units. The region does not change, but the calculations are easier because you can rotate around the x axis.
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