Answer
$x^4-81$
Work Step by Step
Using special products, the given expression is equivalent to
\begin{align*}
&
(x+3)(x-3)(x^2+9)
\\\\&=
(x^2-9)(x^2+9)
\\\\&=
(x^2)^2-9^2
\\\\&=
x^4-81
.\end{align*}
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: 50
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