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Question $9$$\newline$Enter the function $f(x)=x^{2}-18 x+6$ in the form of $f(x)=a(x-h)^{2}+k$, where $a, h$, and $k$ are constants. Enter your answer in the first response box.$\newline$Enter the $x$-coordinate of the vertex of the graph of $f$ in the second response box.$\newline$$$f(x)=$$$\newline$$\square$$\newline$$$x=$$$\newline$$\square$