\[x^{2} - 6x + c < 0\]
\[x^{2} - 6x + c = 0\]
\[D = 36 - 4c\]
\[(1;5):\]
\[x_{1} = 1:\]
\[1^{2} - 6 \cdot 1 + c = 0\]
\[c = 5.\]
\[x_{2} = 5:\]
\[25 - 30 + c = 0\]
\[Ответ:при\ c = 5.\]