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If A is matrix such that A^(2) +A + 2I =...

If A is matrix such that `A^(2) +A + 2I = O` then which of the following is not true ?a)A is symmetric b)A is non - singular c)`|A| ne O` d)`A^(-1) = - (1)/(2) (A+ I)`

A

A is symmetri

B

A is non - singular

C

A ! = O

D

`A^(-1) = - (1)/(2) (A+ 1)`

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The correct Answer is:
A
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