Answer
$1240$
Work Step by Step
$\sum ^{15}_{i=1}i^{2}=\dfrac {n\left( n+1\right) \left( 2n+1\right) }{6}=\dfrac {15\times \left( 15+1\right) \times \left( 2\times 15+1\right) }{6}=1240$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
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 - Page 1015: 77
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