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Find the volume of the solid generated when the region enclosed by 
y=-sqrt(x+1),y=0, and 
x=2 is revolved about the 
x-axis.

Find the volume of the solid generated when the region enclosed by y=x+1,y=0 y=-\sqrt{x+1}, y=0 , and x=2 x=2 is revolved about the x \mathrm{x} -axis.

Full solution

Q. Find the volume of the solid generated when the region enclosed by y=x+1,y=0 y=-\sqrt{x+1}, y=0 , and x=2 x=2 is revolved about the x \mathrm{x} -axis.
  1. Identify Curves and Limits: Identify the curves and limits for integration.\newlineThe region is bounded by y=x+1y = -\sqrt{x+1}, y=0y = 0, and x=2x = 2. The solid is revolved around the xx-axis, so we use the disk method.
  2. Set Up Integral for Volume: Set up the integral for the volume.\newlineThe volume VV of the solid of revolution is given by the integral of π\pi times the square of the radius of the disks. The radius here is the y-value, which is x+1-\sqrt{x+1}, and the limits of integration are from x=1x = -1 to x=2x = 2.\newlineV=πx=1x=2(x+1)2dxV = \pi \int_{x=-1}^{x=2} (-\sqrt{x+1})^2 \, dx

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