Answer
$a_{20}=300$
Work Step by Step
We have to find $a_{20}$ if $a_n=n^2-5n$.
So we substitute $n=20$ in the general term formula:
$a_{20}=20^2-5\cdot20=400-100=300$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 14 - Sequences, Series, and the Binomial Theorem - Mid-Chapter Review - Mixed Review - Page 915: 3
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