So I set up everything to find the limit as b approaches infinite. After integration, I have;
Good. So now you must evaluate
The problem I have is when applying the FTC with b. I know it ends up being zero, but I don't understand how. There are 2 x values there to replace with infinity, how can I evaluate the outcome?
Also, I think I'm doing something wrong with replacing the x values with 7 because the result is a complicated number;