JEE Math Practice Question
If the matrix $$A = \left( {\begin{matrix} 0 & 2 \\ K & { - 1} \\ \end{matrix} } \right)$$ satisfies $$A({A^3} + 3I) = 2I$$, then the value of K is :
- A.$${1 \over 2}$$
- B.$$-$$$${1 \over 2}$$
- C.$$-$$1
- D.1
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