College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 8, Sequences and Series - Section 8.6 - The Binomial Theorem - 8.6 Exercises: 34

Answer

$4845a^{16}b^{16}$

Work Step by Step

We find the 5th term in the expansion of $(ab-1)^{20}$ by using Binomial Theorem coefficients: $\left(\begin{array}{l}20\\4\end{array}\right) (ab)^{16} (-1)^{4}=4845(a^{16}b^{16})(1)=4845a^{16}b^{16}$
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