Answer
$9x^6+15x^4+3x^2+1$
Work Step by Step
Using $(a+b)(c+d)=ac+ad+bc+bd$ or the FOIL Method, the expression, $
(3x^4+1)(3x^2+5)
$, is equivalent to
\begin{array}{l}
3x^4(3x^2)+3x^4(5)+1(3x^2)+1(5)
\\\\=
9x^6+15x^4+3x^2+1
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Section 5.4 - Multiplying Polynomials - Exercise Set - Page 289: 63
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