Answer: k = 1 or k = −2.
- A k = 1 or k = −2
- B k = 0 or k = 1
- C k = −1 or k = 2
- D k = 2 only
Correct answer: A. k = 1 or k = −2
Explanation: The coefficient determinant is −(k − 1)²(k + 2), which vanishes at k = 1 or k = −2.
Concept context
Evaluation of determinants, cofactors, adjoint, inverse of matrix, Cramer's rule and area applications. Always in board and JEE.