We are learning summation currently, but since he is not finished with the lesson he assigned us a few more substitution problems. I am finding them very difficult, actually.

I let u= to get du=

All that's missing in the original problem is "2". I have never encountered a problem where taking the derivative of u would substitute theentireproblem, with the exception of 2, of course. The only thing I'd get out of it is , and that doesn't seem right.

Next problem is also causing me some difficulty...

I let u= to get du=

Final answer

I have a huge hunch I did that one wrong.

Any assistance is greatly appreciated, as always.