Question

Use the scenario to answer the question. Tyrone was asked to write the recursive and explicit formula for the sequence {−4,−7,−10,−13,…}. He wrote the recursive formula as a1=−4 and an=−4−3. He wrote the explicit formula as an=−4−3(n−1). Where did he make a mistake?
In his recursive formula, he should have added 3 instead of subtracting 3 to get an=−4+3.

In his explicit formula, the −4 is not necessary. He should have written an=−3(n−1).

In his explicit formula, he should have used n−3 instead of n−1 to get an=−4−3(n−3).

In his recursive formula, he should have the term an−1 instead of −4 to get an=an−1−3.

Answer 1

The last option: In his recursive formula, he should have the term an−1 instead of −4 to get an=an−1−3.