SOLUTION: find the next two terms in the sequence -5,8,-13,20,-29

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Question 712133: find the next two terms in the sequence -5,8,-13,20,-29
Answer by kevwill(135) About Me  (Show Source):
You can put this solution on YOUR website!
Ignoring the alternating signs for the moment, for the sequence

5, 8, 13, 20, 29, ...

the nth term is given by x+=+n%5E2+%2B+4

We account for the alternating signs by multiplying each term by -1%5En

so the formula for the nth term in the original sequence is

x+=+%28-1%29%5En+%2A+%28n%5E2+%2B+4%29+

and the next two terms are 40 and -53.