SOLUTION: For each sequence, find a closed formula for the general term, a sub n. a) -2,-8,-18,-32,-50 b)96,94,92,90,88 c)-58,-580,-5800,-58000,-580000

Question 1021048: For each sequence, find a closed formula for the general term, a sub n.
a) -2,-8,-18,-32,-50
b)96,94,92,90,88
c)-58,-580,-5800,-58000,-580000
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
a) , which can be verified directly for n = 1, 2, 3, 4, 5...
b) This is an arithmetic sequence, so the general nth formula is , with and d = -2
==> for n = 1, 2, 3, 4, 5...

c) This is a geometric sequence, where for n = 1, 2, 3, 4, 5...
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