Answer
$36x^{4}$
Work Step by Step
Using $x^a\cdot x^b=x^{a+b}$, the given expression, $
(9x)(4x^3)
,$ simplifies to
\begin{array}{l}\require{cancel}
(9)(4)x^{1+3}
\\\\=
36x^{4}
.\end{array}
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 5 - Exponents and Polynomials - 5.2 - Multiplying Monomials - Problem Set 5.2 - Page 200: 4
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