Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 11 - Sequences; Induction; the Binomial Theorem - Section 11.2 Arithmetic Sequences - 11.2 Assess Your Understanding - Page 834: 38

Answer

$n(n+1)$

Work Step by Step

Use a summation formula, we have $2+4+6+...+2n=\frac{n}{2}(a_1+a_n)=\frac{n}{2}(2+2n)=n(n+1)$
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