That is our u. So let's rewrite this indefinite integral in terms of u. It's going to be equal to 1 7th times the integral of, and I'll just take the seven and put it in the back so we can just write the square root of u, square root of u, du, seven times dx is du. And we can rewrite this if we want as u to the 1 1⁄2 power. It makes it a little bit easier for us to kind of do the reverse power rule here. So we can rewrite this as equal to 1 7th times the integral of u to the 1 1⁄2 power du. And let me just make it clear.