In: Math
1. use the shell method to write and evaluate the definite internal that represents the volume of the solid generated by revolving the plan region about the x-axis. x+y^2=4
2. use the shell method find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the given line. y=(x)^1/2. y=0 x=4. about the line x=6
1. The parabola can be sketched as below
Using the method of shells,
For the given curve,
Hence, the integral works out to
2. The region is again a parabola, and this time the axis of rotation is parallel to the Y axis. The region to be rotated in shown in orange in the sketch below
Again using the method of shells and keeping in mind that the axis is now x = 6 so radius will be (6 - x),