(x-4)^2+8*(x-2)

(x-4)^2+8*(x-2)

$\begin{array}{|rcll|} \hline && (x-4)^2+8\cdot (x-2) \\ &=& x^2-8x+16 +8x-16 \\ &=& x^2 \\ \hline \end{array}$