That function doesn't look right . . .
We can cancel the and have: .
So I suspect that it is: .
The ratio is: .
. . . . . which diverges.
heres the problem: http://img211.imageshack.us/img211/4962/93204887ca3.png
i used the ratio test to get 4n+6 |x|
normally i would just subtract or add whats inside the absolute value to each side of x. and then divide by the 6|x| i believe.
i'm really confused by the 4n+6, how do i get the radius of convergence now?
also, its possible this problem diverges.
thanks for any help.