What is the determinant of the 2x2 matrix A = [[3, 2], [1, 4]]?
Answer and explanation
Correct answer: B. 10
- Step 1: For a 2x2 matrix [[a, b], [c, d]], the determinant is ad - bc. Step 2. Here det(A) = 34 - 21 = 12 - 2 = 10. Answer: 10. Why not the others: A non-zero determinant indicates that matrix A is invertible.
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