Answer
$(x^2-13)(x^2+3)$
Work Step by Step
$x^4-10x^2-39=\\=x^4-13x^2+3x^2-39\\=x^2(x^2-13)+3(x^2-13)\\=(x^2-13)(x^2+3)$
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 - Review Exercises - Page 400: 49
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