Answer
$n^2+ 18n + 81$
Work Step by Step
$n^2+ xn + 81$
$\rightarrow n^2+ 2.n.b+9^2$
Use the formula $(a+b)^2=a^2+2ab+b^2 \rightarrow b=9$
The missing value in each perfect-square trinomial is $2*9=18$
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 8 - Polynomials and Factoring - Chapter Test - Page 539: 30
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