For what value(s) of kkk is det(k23k)=0\det\begin{pmatrix} k & 2 \\ 3 & k \end{pmatrix} = 0det(k32k)=0?
k=6k = 6k=6 or k=−6k = -6k=−6
k=6k = \sqrt{6}k=6 or k=−6k = -\sqrt{6}k=−6
k=3k = 3k=3
k=2k = 2k=2