Answer
$...=3^{2}n^{n}$
Work Step by Step
$(3n)^{2}=3n\cdot 3n=(3\cdot 3)(n\cdot n)=3^{2}n^{2}$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 7 - Exponents and Exponential Functions - Concept Byte - Page 432: 11
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