\[y = x^{2} - 4x + 3\]
\[x_{0} = - \frac{b}{2a} = \frac{4}{2} = 2;\]
\[y_{0}(2) = 2^{2} - 4 \cdot 2 + 3 =\]
\[= 4 - 8 + 3 = - 1.\]
\[Ответ:(2; - 1).\]