Answer: 5.
- A 5
- B 6
- C 2
- D 3
Correct answer: A. 5
Explanation: Sum of eigenvalues = trace(A) = 3 + 2 = 5. Eigenvalues can also be computed: det(lambda*I-A) = (lambda-3)(lambda-2)-2 = lambda<sup>2</sup>-5lambda+4=0. lambda=1,4. Sum=5.
Element aij of matrix A sits at the intersection of row i and column j.
Concept context
Matrix operations, determinants, inverses, and solving linear systems