Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 11 - Further Topics in Algebra - 11.1 Sequences and Series - 11.1 Exercises: 46

Answer

$135$

Work Step by Step

$\sum ^{7}_{i=3}\left( 5i+2\right) =5\sum ^{7}_{i=3}i+\sum ^{7}_{i=3}2=5\left( \sum ^{7}_{i=1}i-\sum ^{2}_{i=1}i\right) +\sum ^{5}_{i=1}2=5\left( \dfrac {7\times \left( 7+1\right) }{2}-\dfrac {2\times \left( 2+1\right) }{2}\right) +2\times 5=135$
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