#### 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:
$9z^4+81z=9z(z^3+9)$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$9z(z^3+9)$

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