Answer
$(7x^2+9)(4x-1)$
Work Step by Step
$28x^3+36x-7x^2-9=\\=4x(7x^2+9)-1(7x^2+9)\\=(7x^2+9)(4x-1)$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 5 - Section 5.3 - Greatest Common Factors and Factoring by Grouping - Exercise Set - Page 349: 103
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