So this is going to be equal to pi times the definite integral from y is equal to negative 1 to y is equal to 3. If you expand this out, you get square root of y plus 1 squared, which is just going to be y plus 1. And then you're going to have 2 times the product of both of these terms. 2 times 2 times square root of y plus 1 is going to be plus 4 times the square root of y plus 1. And then you have 2 squared, so plus 4. So you have this whole thing times dy. We can simplify a little bit.