Answer
$x^2-6x+9$
Work Step by Step
Using $(a\pm b)^2=a^2\pm2ab+b^2$ or the square of a binomial, the square of the given expression, $
(x-3)^2
,$ is
\begin{array}{l}\require{cancel}
(x)^2-2(x)(3)+(3)^2
\\\\=
x^2-6x+9
.\end{array}
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