00:01
So if you know what the graph of 4 minus x squared looks like, so that's the main thing, y equals 4 minus x squared.
00:11
And if you didn't know, they give you the y equals 4 that this graph is actually touching because it's shifted up 4 with a downwards parabola.
00:19
And also x equals 2 is not only part of the bounds, but it's also what we're revolving around.
00:26
So this is just a disk method.
00:28
If you look closely at it, pi times the function squared.
00:36
And because it's a vertical line we're revolving around, i would include, well, you have to do it in terms of y, if you're doing the disk method.
00:43
So the bounds are from zero to four.
00:46
And, well, what i would probably do is rewrite this as x equals.
00:54
So i'd probably add x squared to the left side as i subtract y, to the right side.
01:02
And this function would be x equals the square root of four minus y.
01:09
But what i need is each radius is this length.
01:13
So it would be two minus that piece.
01:18
And this is kind of gross, if i'm being honest.
01:22
But you can foil this out because two times two is four, you would have two roots of four minus y...