Answer: A = A T.
- A A = A<sup>T</sup>
- B A = -A<sup>T</sup>
- C A<sup>T</sup> = 0
- D det(A) = 0
Correct answer: A. A = A<sup>T</sup>
Explanation: A matrix A is symmetric if A = A<sup>T</sup>, meaning element a<sub>ij</sub> = a<sub>ji</sub> for all i, j.
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