Answer
$9z(z^3+9)$
Work Step by Step
Note that:
$9z^4=9z(z^3)
\\81z=9z(9)$
Thus, the greatest common factor is $9z$.
Factor out $9z$ to obtain:
$9z^4+81z=9z(z^3+9)$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.4 Factoring Polynomials - R.4 Exercises - Page 43: 14
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