Answer
Substituting $n = 4$ in the equation for $a_{n}$ gives:
$a_{4} = 4^{2}-4 = 12$
Work Step by Step
For this problem, simply plug in n = 4 into the equation given, $a_n = n^2 -n$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 11 - Infinite Series - 11.1 Sequences - Preliminary Questions - Page 537: 1
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