Answer
$a_n=n-4$
Work Step by Step
We can see that to the subsequent terms' differences are $1$ and $a_1=-3$, so $a_n=n-4$ for all $n$ natural numbers.
University Calculus: Early Transcendentals (3rd Edition)
by Hass, Joel R.; Weir, Maurice D.; Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0321999584
ISBN 13:
978-0-32199-958-0
Chapter 9 - Section 9.1 - Sequences - Exercises - Page 487: 20
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