Find the tneth term of the sequence.
3, 2, -1, -6, -13,...
The tenth term is=
-1 -3 -5 - 7 -9 -11 -13 -15 -17 -19
3 2 -1 -6 -13 -22 -33 -46 -51 -68 -87
*** edited **** Made a small math error
-1 -3 -5 - 7 -9 -11 -13 -15 -17
3 2 -1 -6 -13 -22 -33 -46 -61 -78
Your sequence is:
3, 2, -1, -6, -13, -22, -33, -46, -61, -78, -97, -118, -141, -166, -193, ...etc.
Closed form: a_n = -n^2 + 2 n + 2
10th term: a(10) =- 10^2 + 2*10 + 2 == - 78
+44 
