Question

The following sequence is an arithmetic sequence. [-9, -2, 5, 12,...]

Find the common difference and the next two terms.

Answer 1

Answer: The common difference is 7, and the next two terms are 19 and 26.

Explanation:

Between -9 and -2 there is +7, same with between -2 and 5, as well as 5 and 12. Adding 7 to 12 again gets 19, and adding 7 to 19 gets 26 as well for the next two terms.