Answer
$9x^4-y^2$
Work Step by Step
The product of a binomial sum and a binomial difference is: $(A+B)(A-B)=A^2-B^2$.
Hence: $(3x^2-y)(3x^2+y)=(3x^2)^2-y^2=9x^4-y^2$
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 - Cumulative Review Exercises - Page 402: 17
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