Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Appendix E - Sigma Notation - E Exercises - Page A38: 22



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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