Linear Systemshard
0:00.0

For what value of cc does the homogeneous system [122c][xy]=[00]\begin{bmatrix} 1 & 2 \\ 2 & c \end{bmatrix} \begin{bmatrix} x \\ y \end{bmatrix} = \begin{bmatrix} 0 \\ 0 \end{bmatrix} have infinitely many nontrivial solutions?