SOLUTION: Write the explicit formula that represents the geometric sequence -2, 8, -32, 128

Question 1068107: Write the explicit formula that represents the geometric sequence -2, 8, -32, 128

Found 2 solutions by Edwin McCravy, Fombitz:
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!

The terms of the sequence are the odd powers of 2 with alternating signs. The general term for the sequence of exponents 1, 3, 5, 7, ... is The general term for the sequence of multipliers 1, -1, 1, -1, 1, ... which causes alternating signs is So the general formula is Edwin

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Look at each successive term compared to the previous term,

So,

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