\(\Leftrightarrow\left\{{}\begin{matrix}\Delta'>0\\f\left(-2\right)>0\\\frac{S}{2}>-2\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}\left(m+1\right)^2-\left(m^2+4\right)>0\\4+4\left(m+1\right)+m^2+4>0\\m+1>-2\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}2m-3>0\\\left(m+2\right)^2+8>0\\m>-3\end{matrix}\right.\) \(\Rightarrow m>\frac{3}{2}\)