If det(x12x)=0\det \begin{pmatrix} x & 1 \\ 2 & x \end{pmatrix} = 0det(x21x)=0, what are the possible values for xxx?
2,−2\sqrt{2}, -\sqrt{2}2,−2
1,21, 21,2
000
4,−44, -44,−4