Answer
$(1+4y)(x^3-5)$
Work Step by Step
$x^3-5+4x^3y-20y=\\=x^3+4x^3y-5-20y\\=x^3(1+4y)-5(1+4y)\\=(1+4y)(x^3-5)$
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 348: 71
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