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$(x - 8)^2$
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Explanation:

Step1: Apply square of binomial formula

Recall $(a-b)^2=a^2-2ab+b^2$, let $a=x$, $b=8$.

Step2: Substitute values into formula

$$\begin{align*} (x-8)^2&=x^2-2(x)(8)+8^2\\ &=x^2-16x+64 \end{align*}$$

Answer:

$x^2-16x+64$