Question

Answer 1

\(\left\{{}\begin{matrix}\Delta'=m^2-\left(m^2+m+4\right)>0\\x_1+x_2=4\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}-m-4>0\\-2m=4\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}m< -4\\m=-2\end{matrix}\right.\)

\(\Rightarrow\) Không có m thỏa mãn