Answer
$n(n+1)$
Work Step by Step
Use a summation formula, we have
$2+4+6+...+2n=\frac{n}{2}(a_1+a_n)=\frac{n}{2}(2+2n)=n(n+1)$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
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
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