Answer
$x^{5}+x^{6}+x^{7}+x^{8}$
Work Step by Step
We expand the sigma notation by writing $x^{k}$ as $k$ increases from 5 to 8:
$\displaystyle \sum_{k=5}^{8}x^{k}=x^{5}+x^{6}+x^{7}+x^{8}$
Calculus: Early Transcendentals 8th Edition
by Stewart, James
Published by
Cengage Learning
ISBN 10:
1285741552
ISBN 13:
978-1-28574-155-0
APPENDIX E - Sigma Notation - E Exercises - Page A 38: 6
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