[tex]\frac{mx^2+x-2}{x^2+1}\leq 0, \forall x\in R.\\
Stim\ ca:\ x^2+1\geq 0,\forall x\in 0\\
Trebuie\ sa\ rezolvam\ deci\ urmatoarea\ ecuatie:\\
mx^2+x-2\leq 0\\
Notam: f(x)=mx^2+x-2\\
f(x) \leq 0\Leftrightarrow \left \{ {{m\ \textgreater \ 0} \atop {\Delta\leq 0}} \right. \\
\Delta=1+8m\\
8m+1\leq 0\\
8m \leq -1\\
m \leq -\frac{1}{8}\\
Dar\ m\ \textgreater \ 0\Rightarrow S:m=\phi[/tex]