Question

b(n) = -8 - 2(n - 1)
Find the 9th term in the sequence.

Answer 1

Answer:

Now, I've done the usual and found the differences, and it goes down to four levels until I get a common difference, suggesting I have to use n4 somewhere, but I just can't find the nth term. Any help? And if you know of any easier methods to finding the nth term, I'd appreciate it.

P.S. - I know about the formulas for arithmetic progression and geometric progression, but clearly neither can be used here.

Step-by-step explanation:

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