# Chapter 8 - Polynomials and Factoring - Chapter Review - Page 538: 77

$(5z^{2}+1)(9z+4)$

#### 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. $=(5z^{2}+1)(9z+4)$

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