[tex]\it Condi\c{\it t}ii:\\ \\ m < 0\ \ \ \ \ (1)\\ \\ \Delta < 0 \Rightarrow (m-1)^2-4m(m-1) < 0 \Rightarrow (m-1)(m-1-4m) < 0 \Rightarrow \\ \\ \Rightarrow (m-1)(-3m-1) < 0 \Rightarrow (3m+1)(m-1) > 0 \Rightarrow m\in\marhbb R\setminus\[[-\dfrac{1}{3},\ 1]\ \ \ (2)\\ \\ \\ (1),\ (2) \Rightarrow m\in\ (-\infty,\ \ -\dfrac{1}{3})[/tex]
