If $$B = \left[ {\matrix{
5 & {2\alpha } & 1 \cr
0 & 2 & 1 \cr
\alpha & 3 & { - 1} \cr
} } \right]$ is the inverse of a 3 × 3 matrix A, then the sum of all values of $\alpha $$ for which
det(A) + 1 = 0, is :
2
- 1
0
1
Solution
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