Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 12 Sequences and Series - 12.2 Analyze Arithmetic Sequences and Series - 12.2 Exercises - Skill Practice - Page 807: 50

Answer

$a_n=2-3n$

Work Step by Step

We know that the general formula of an arithmetic sequence is given by $a_n=a_1+(n-1)d$ Here, we have $d=-3$ $a_n=a_1+(n-1)d$ This gives: $a_n=-1+(n-1) \times (-3)$ or, $a_n=-1-3n+3$ Hence, $a_n=2-3n$
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