If A = [[x, 2], [2, x]] is a singular matrix, then x equals:
If A = [[x, 2], [2, x]] is a singular matrix, then x equals:
- A. ±2
- B. 0
- C. 1
- D. 4
Answer: A) ±2
Explanation: A matrix is singular if its determinant is 0. det(A) = x² − 4 = 0 → x² = 4 → x = ±2.
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