The du becomes x^2 but I don't know what to do with the second one. It could become arctan u, but the fact that it's and not just prevents that from happening.
I'm pretty sure I messed up on the du in the solution. But I don't understand... isn't that what it's supposed to be? du is 2x and when it's integrated it should become x^2.
I'm pretty sure I messed up on the du in the solution. But I don't understand... isn't that what it's supposed to be? du is 2x and when it's integrated it should become x^2.
Once you get the integral to use the same trigonometric substitution I explained to you in another thread.