\[f(x) = x^{2} - 6x + 4\]
\[x_{0} = - \frac{b}{2a} = - \frac{- 6}{2} = 3;\]
\[y_{0} = 3^{2} - 6 \cdot 3 + 4 =\]
\[= 9 - 18 + 4 = - 5.\]
\[Ответ:(3;\ - 5).\]