Problem

Find the common difference, d, for the arithmetic sequence. See Example.Example 3 Find the...

Find the common difference, d, for the arithmetic sequence. See Example.

Example 3 Find the common difference, d, for the following arithmetic sequences.
a. −4, −1, 2, 5, 8, …
Or we could use d = 5 − 2 = 3 and so on.
b. 8, 6, 4, 2, 0, …
Solution: Pick any term (except the first) and subtract the term before it.
Or we could use d = 2 − 4 = −2 and so on.

25, 22, 19, 16,…

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