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Use the method of cylindrical shells to find the volume of the solid obtained by rotating the region bounded by the given curves about the x-axis.x = 3 + (y − 4)2,  x = 4

Question

Use the method of cylindrical shells to find the volume of the solid obtained by rotating the region bounded by the given curves about the x-axis.x = 3 + (y − 4)2,  x = 4

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Solution

The method of cylindrical shells is a method for finding the volume of a solid of revolution. The idea is to approximate the volume of the solid by a sum of the volumes of cylindrical shells, and then to take the limit as the number of shells goes to infinity.

Here are the steps to solve the problem:

  1. Identify the region: The region is bounded by the curves x = 3 + (y - 4)^2 and x = 4. This is a vertical strip in the xy-plane.

  2. Identify the axis of rotation: The axis of rotation is the x-axis.

  3. Set up the integral: The volume V of the solid is given by the integral V = ∫[a,b] 2πrh dx, where r is the radius of the cylindrical shell and h is the height of the cylindrical shell. In this case, r = y and h = 4 - (3 + (y - 4)^2).

  4. Evaluate the integral: We need to find the limits of integration a and b. To do this, we set the two functions equal to each other and solve for y:

    3 + (y - 4)^2 = 4 (y - 4)^2 = 1 y - 4 = ±1 y = 5, 3

So, a = 3 and b = 5. The volume is then given by:

V = ∫[3,5] 2πy(4 - (3 + (y - 4)^2)) dy

  1. Simplify and compute the integral: Simplify the integrand and then use the Fundamental Theorem of Calculus to compute the integral.

  2. The final answer will be the volume of the solid obtained by rotating the region bounded by the given curves about the x-axis.

This problem has been solved

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