Find the trace (sum of the diagonal elements) of .
Answer and explanation
Correct answer: D. 2
- Step 1: The trace of a square matrix is defined as the sum of the elements along its main diagonal: .
- Step 2: Read the diagonal entries from the given matrix: and .
- Step 3: Sum the diagonal elements: .
Answer
2.
Why not the others: The remaining values (-6, 0, -4) result from evaluating the determinant instead of the trace, adding off-diagonal entries, or sign errors.
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