For which values of xxx is det(x21x)=2\det \begin{pmatrix} x & 2 \\ 1 & x \end{pmatrix} = 2det(x12x)=2?
x=2x = 2x=2
x=−2x = -2x=−2
x=0x = 0x=0
x=±2x = \pm 2x=±2