Answer
$(5z^{2}+1)(9z+4)$
Work Step by Step
$45z^{3}+20z^{2}+9z+4=$
...factor by grouping- pair up the first with the third term and the second with the last.
$=9z(5z^{2}+1)+4(5z^{2}+1)$
...use the Distributive Property.
$=(5z^{2}+1)(9z+4)$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 8 - Polynomials and Factoring - Chapter Review - Page 538: 77
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