Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 11 - Section 11.1 - Sequences and Summation Notation - Exercise Set - Page 831: 84


$a_n=n(n+2)$; $n=1,2,3,4,....$

Work Step by Step

Since, we have $1 \cdot 3,2 \cdot 4,3 \cdot 5,4 \cdot 6...$ or, $1 \cdot (1+2),2 \cdot (2+2),3 \cdot (3+2),4 \cdot (4+2)...$ This sequence shows an arrangement of alternate signs. which can be represented as: $a_n=n(n+2)$; $n=1,2,3,4,....$
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