Find a recursive formula for the sequence:
3, -5, 11, -21
1 answer:
The correct option is the last:

In fact, every term in the sequence is one more than twice the opposite of the previous one:
We start with 3. Twice its opposite is -6. Plus one, we get -5.
We start with -5. Twice its opposite is 10. Plus one, we get 11.
We start with 11. Twice its opposite is -22. Plus one, we get -21.
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-7 -14(1/7)
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14 * 1/7 = 2 (14/1 * 1/7 = 2/1 which we reduce to just 2)
-7 -2
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Step-by-step explanation: