Had one problem with my math homework:
So I tried
So then: ,
So the integration appears as:
Which simplifies to: , which is where I get stuck.
Any advice on moving forward, or a different, easier method?
Your algebra is a bit messy.
First, use linearity to pull out the 1 term from the integral and get
Remembering that and thus you get
Your mistake was that from the first integral to the second (after performing the substitution), you multiplied only the factor by instead of the whole integrand. You also forgot a +25 in the denominator there.