Algebra-1

To write the recursive formula for the sequence 21,17,13,9,… (where n>1), follow these steps:

Identify the common difference: Calculate the differences between consecutive terms:

17−21=−4

13−17=−4

9−13=−4

 The common difference d is −4.

Write the recursive formula:

The general form of the recursive formula for an arithmetic sequence is:

= + d

In this case, the common difference d is −4. The first term

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