Answer
$x^2-10x+25$
Work Step by Step
Using the special product on squaring binomials, $(a+b)^2=a^2+2(a)(b)+b^2$, the given expression simplifies to
\begin{align*}
&
(x-5)^2
\\\\&=
x^2+2(x)(-5)+(-5)^2
\\\\&=
x^2-10x+25
.\end{align*}
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