SOLUTION: For the following geometric sequence find the recursive formula: {-1, 3, -9, ...}.

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Question 1068919: For the following geometric sequence find the recursive formula: {-1, 3, -9, ...}.

Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.
You either know or don't know what is a geometric progression.

If you know, you will solve the problem in 3 seconds.

If you don't know then learn it.

You may use the lessons
    - Geometric progressions
    - The proofs of the formulas for geometric progressions
    - Problems on geometric progressions
in this site.

But if you WILL NOT learn it, you will NEVER solve this problem and will NEVER understand how to solve it.

So, the choice is up to you.