question_answer

If \[M=\left[ \frac{1}{2}\,\,\,\frac{2}{3} \right]\]  and \[{{M}^{2}}-\lambda \,\,M-{{I}_{2}}=0,\] then \[\lambda =\]

A)  \[-2\]                           

B)  2

C)  \[-4\]                           

D)  4

E)  None of these