If \( A \) is a matrix such that \( A^{2}+A+2 I=0 \), then
which of the following is/are true?.... VIDEO
If \( A \) is a matrix such that \( A^{2}+A+2 I=0 \), then
\( \mathrm{P} \)
which of the following is/are true?
(1) \( A \) is non-singular
(2) \( A \) is symmetric
(3) \( A \) cannot be skew-symmetric
(4) \( A^{-1}=-\frac{1}{2}(A+I) \)
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