I see now that i did these power series by pattern and now I'm stuck big time :D
Problem is ...
so i found R as
and than i sow x is at power -2n and here is my problem...
should I do it like this : (to see region of convergence)
or like this ...
or I am way of with this ?
can someone please explain to me what to do when i have "x" like i do here :D
thanks in advance :D