Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 11 - Section 11.3 - Series - Exercise Set: 59b

Answer

$168$

Work Step by Step

The expression $ \displaystyle\sum_{i=1}^7 i+\displaystyle\sum_{i=1}^7 i^2 $ evaluates to \begin{array}{l} 1+2+3+4+5+6+7+\displaystyle\sum_{i=1}^7 i^2 \\= 28+\displaystyle\sum_{i=1}^7 i^2 \\= 28+1^2+2^2+3^2+4^2+5^2+6^2+7^2 \\= 28+1+4+9+16+25+36+49 \\= 168 .\end{array}
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