Answer
$3x^{2n}+5x^ny^n-2y^{2n}$
Work Step by Step
I use the FOIL method:
$(3x^n-y^n)(x^n+2y^n)=3x^{2n}+6x^ny^n-x^ny^n-2y^{2n}=3x^{2n}+5x^ny^n-2y^{2n}$
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 5.2 - Multiplication of Polynomials - Exercise Set - Page 338: 53
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