Вопрос:

Ответ:

\[x^{2} - 6x + 8 < 0\]

\[D_{1} = 9 - 8 = 1\]

\[x_{1} = 3 + 1 = 4;\]

\[x_{2} = 3 - 1 = 2;\]

\[(x - 2)(x - 4) < 0\]

\[2 < x < 4.\]