So x is equal to 0, or x minus 1 is equal to 0. And then you get x equals 0, or x is equal to 1. x is equal to 0, or x equals 1, which gives us our boundaries of integration. So this goes from x equals 0 to x equals 1. And so for the outside of our shape, we can now figure out the volume. But we're not done. We also need to figure out the volume of the inside of our shape that we're going to take out. So we're going to subtract out that volume.