Algebra-1

To find the explicit formula for the sequence 7,3,−1,−5,…, follow these steps:

Determine the common difference d:

The sequence decreases by 4 each time (e.g., 3−7=−4, −1−3=−4).

Use the formula for the n-th term of an arithmetic sequence:

= + (n − 1)d

Where  

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