And now what's really interesting is here is we have our u right over there, and notice we have our two x plus one times dx. In fact, it's not conventional to see an integral rewritten the way I'm about to write it, but I will. I could rewrite this integral. You should really view this as the product of three things. Oftentimes, people just view the dx as somehow part of the integral operator, but you could rearrange it. This would actually be legitimate. You could say the integral of the square root of x squared plus x times two x plus one dx.