\[x^{2} - x - q = 0\]
\[x_{1} + x_{2} = 1 \rightarrow x_{1} = 1 - x_{2};\]
\[x_{1} - x_{2} = 4;\]
\[1 - x_{2} - x_{2} = 4\]
\[- 2x_{2} = 3\]
\[x_{2} = - 1,5.\]
\[x_{1} = 1 - ( - 1,5) = 2,5.\]
\[q = x_{1} \cdot x_{2} = 2,5 \cdot ( - 1,5) = - 3,75.\]
\[Ответ:\]
\[x_{1} = 2,5;x_{2} = - 1,5;q = - 3,75.\]