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?
Follow Math Help Forum on Facebook and Google+
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.
View Tag Cloud