SOLUTION: I'm so confused. Can someone pretty please help with this? For the following sequence calculate the indicated term: an=(-1)^n(3n+2),a5 (first n and the 5 are subscript)

Algebra ->  Sequences-and-series -> SOLUTION: I'm so confused. Can someone pretty please help with this? For the following sequence calculate the indicated term: an=(-1)^n(3n+2),a5 (first n and the 5 are subscript)      Log On


   

Question 967305: I'm so confused. Can someone pretty please help with this?
For the following sequence calculate the indicated term:
an=(-1)^n(3n+2),a5 (first n and the 5 are subscript)
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

a%5Bn%5D=%28-1%29%5E%28n%283n%2B2%29%29,
if you need fifth term a%5B5%5D+, means n=5; so, substitute it in given formula
a%5B5%5D=%28-1%29%5E%285%283%2A5%2B2%29%29
a%5B5%5D=%28-1%29%5E%285%2815%2B2%29%29
a%5B5%5D=%28-1%29%5E%285%2817%29%29
a%5B5%5D=%28-1%29%5E%2885%29....since 85 is an odd number we will have negative sign
a%5B5%5D=-1