In Exercises, find a formula for a_n for the arithmetic sequence. a_1 = 1, d = 3.
Added by Jeff F.
Step 1
This means that to get from one term to the next, we add 3. So, to get from a_1 to a_2, we add 3: a_2 = a_1 + d = 1 + 3 = 4. To get from a_2 to a_3, we add 3 again: a_3 = a_2 + d = 4 + 3 = 7. We can see that each term is 3 more than the previous term. So, we Show more…
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