Find a formula an for the nth term of the arithmetic sequence whose first term is a1 = −6 such that an − 1 − an = 9 for n ≥ 1.

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter8: Sequences, Series,and Probability
Section8.2: Arithmetic Sequences And Partial Sums
Problem 2ECP: Find a formula for the nth term of the arithmetic sequence whose common difference is 5 and whose...
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Find a formula

an

for the nth term of the arithmetic sequence whose first term is

a1 = −6

such that

an − 1 − an = 9

for

n ≥ 1. 
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