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Matrices and Determinants question

2019 · 12 Apr · Shift 1 · Q30

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JEE Main
Mathematics
Matrices and Determinants
2019 · 12 Apr · Shift 1 · Q30

Matrices and Determinants question

2019 · 12 Apr · Shift 1 · Q30

JEE MainMathematicsMatrices and DeterminantsMCQ+4 / −1

If

B = \left[ {\begin{matrix} 5 & {2\alpha } & 1 \\ 0 & 2 & 1 \\ \alpha & 3 & { - 1} \\ \end{matrix} } \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 :

A
2
B
- 1
C
0
D
1

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