Answer
$(x-9)^2$
Work Step by Step
Using the factors of $81$, we have $-9$ and $-9$ because $-9-9=-18$ and $(-9)(-9)=81$
$$
x^2-18x+81=(x-9)(x-9)=(x-9)^2
.$$
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: 19
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