Answer
$(x-5)^{2}$
Work Step by Step
If $a$ and $b$ are real numbers, we know that $a^{2}-2ab+b^{2}=(a-b)^{2}$.
Therefore, we know that $x^{2}-10x+25=(x-5)^{2}$. In this case, $a=x$ and $b=5$.
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