For which values of k is the matrix [[k, 2], [8, k]] singular?
Correct answer: C. k = 4 or -4
- A. k = 2 only
- B. k = -2 only
- C. k = 4 or -4
- D. k = 8 or -8
Explanation
A matrix is singular when its determinant is zero. Here, k² - 16 = 0, so k² = 16 and k = 4 or k = -4.
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