Thank you, glad it was something stupid and not a complete lack of understanding on how to do these.
Pretty confident, then, that I can do these now, but I already uploaded my next two problems, so if someone wouldn't mind checking the answers, I would appreciate it. They're even problems, so not in the back of the book, and the calculator I usually use to check my work doesn't seem to like infinite boundaries.
It's so hard to force myself to do these, I know what I want to do, I have like the next 3 or 4 steps planned in my mind, and then I get bogged down writing out the notation.
Thank you for your help, btw.
This is not a criticism, but I'd be inclined to do it the following way:
The substitution means that the integral limits change from to .
So the integral becomes .
Then I'd do the limit business on this improper integral ..... I just find it makes life a bit easier.
But there is nothing wrong with your approach.