Answer
$(z+9)^2$
Work Step by Step
Factoring by using the factors of 81, we have
$$
z^2+18z+81=(z+9)(z+9)=(z+9)^2
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Review - Page 358: 15
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