Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

APPENDIX E - Sigma Notation - E Exercises: 22

Answer

$122$

Work Step by Step

We expand and simplify the sum: $\displaystyle \sum_{i=3}^{6}i(i+2)$ $3(3+2)+4(4+2)+5(5+2)+6(6+2)$ $=3\cdot 5+4\cdot 6+5\cdot 7+6\cdot 8$ $=15+24+35+48$ $=122$
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