00:01
I'm going to assume from this problem is 4 minus x squared and y equals 0.
00:07
So we're talking about this region in here.
00:10
But what i'm actually going to do, so we have y equals 4 minus x squared, is i'm going to figure out where that intersects the x -axis, so set it equal to zero.
00:23
And when you square root, you do get positive negative 2.
00:28
But if my understanding of this problem is correct, as you revolve, using the show method, what you can do is just consider from zero to two, because as i revolve, it's just going to hit the same points over and over again.
00:43
So the show method is 2 pi from 0 to 2, as i mentioned, of the radius of each one in those cylinders...