The sum of the first nnn terms is Sn=5n2+3nS_n = 5n^2 + 3nSn=5n2+3n. Find the nthn^{th}nth term ana_nan.
10n−210n - 210n−2
10n+210n + 210n+2
5n+35n + 35n+3
10n−110n - 110n−1