$\left\{\begin{array}{l}a=6 \\ b=8 \\ c=-40\end{array}\right.$ | |
$\left\{\begin{array}{l}a=6 \\ b=-8 \\ c=-40\end{array}\right.$ | |
$\left\{\begin{array}{l}a=-6 \\ b=8 \\ c=-40\end{array}\right.$ | |
$\left\{\begin{array}{l}a=6 \\ b=8 \\ c=40\end{array}\right.$ |