Intermediate Algebra (6th Edition)

by Martin-Gay, Elayn

Published by Pearson

ISBN 10: 0321785045

ISBN 13: 978-0-32178-504-6

Chapter 11 - Section 11.5 - The Binomial Theorem - Vocabulary, Readiness & Video Check - Page 663: 10

Answer

We want the 4th term, and when we have a binomial expansion, we want the $(r+1)^{th}$ term.

Work Step by Step

Since $r+1=4$, we see that $r=3$, so that’s why we use $r=3$.

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