First, we need to find the vertex of the parabola. The vertex of a parabola in the form $f(x) = ax^2 + bx + c$ is given by the formula $x = -\frac{b}{2a}$. In this case, $a = 1$ and $b = -17$, so the vertex is at $x = -\frac{-17}{2(1)} = 8.5$.
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