Algebra-1

To find the explicit formula for the sequence 123,117,111,105,…, follow these steps:

Determine the common difference d:

The sequence decreases by 6 each time (e.g., 117−123=−6, 111−117=−6).

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

= + (n − 1)d

Where

Click "Show Answer" to reveal the answer and analysis