$$
\begin{gathered}
f(x)=R(x,\sqrt{ax^{2}+bx+c}) \Rightarrow


\begin{cases}
c > 0 \rightarrow tx \pm \sqrt{c} \\
a > 0 \rightarrow t \pm \sqrt{a}x \\
\Delta > 0 \rightarrow t(x-x_{1})
\end{cases}

\newline
\\ 
\\
\begin{cases}
-2A=1 \\
-B = 2 \\
A+\lambda =0
\end{cases}
\\
\\
\begin{bmatrix}
-2 & 0 & 0 & 1 \\ 0 & -1 & 0 & 2 \\ 1 & 0 & 1 & 0 \\ 
\end{bmatrix}


\end{gathered}




$$