Răspuns :
Ca sa ai semne diferite Δ >0 iar P<0
[tex]\Delta=(m-1)^2-4(m+1)\\ \Delta=m^2-2m+1-4m-4\\ \Delta=m^2-6m-3\\ \Delta=m^2-6m+9-6\\ \Delta=(m-3)^2-6 (presupunem\ ca\ este\ pozitiv)\\ P=\frac{-b}{a}\\ P=-m-1\\ P\ \textgreater \ 0\\ -m-1\ \textgreater \ 0\\ -m\ \textgreater \ 1\\ m\ \textless \ -1=\ \textgreater \ m\ apartine\ (-1,\infinit) [/tex]
[tex]\Delta=(m-1)^2-4(m+1)\\ \Delta=m^2-2m+1-4m-4\\ \Delta=m^2-6m-3\\ \Delta=m^2-6m+9-6\\ \Delta=(m-3)^2-6 (presupunem\ ca\ este\ pozitiv)\\ P=\frac{-b}{a}\\ P=-m-1\\ P\ \textgreater \ 0\\ -m-1\ \textgreater \ 0\\ -m\ \textgreater \ 1\\ m\ \textless \ -1=\ \textgreater \ m\ apartine\ (-1,\infinit) [/tex]
