Let A = [1 2; 3 4]. Which of the following is true?
Let A = [1 2; 3 4]. Which of the following is true?
- A. A is a singular matrix
- B. A⁻¹ does not exist
- C. A² - 5A - 2I = O
- D. |A| = -2
Answer: D) |A| = -2
Explanation: The determinant of A is (1)(4) - (2)(3) = 4 - 6 = -2. Since it is not 0, A is non-singular.
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