Helo, tttcomrader!

You're doing great!

You're probably making simple errors here and there.Find a particular solution of: .

Solution:

The homogeneous solution is: . . . . . Right!

Now, my first guess for the particular solution is: .

I have all terms repeated here, so multiply by x to all, obtains:

. .

Would that be the right guess? . . . . Yes!

It took me a few tries to get it right . . .

I finally got: .