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:
$\left(\begin{array}{l}20\\4\end{array}\right) (ab)^{16} (-1)^{4}=4845(a^{16}b^{16})(1)=4845a^{16}b^{16}$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
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 - Page 636: 34
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