CUET · MATHS · PYQ PAPER 2025
If A and B are symmetric matrices of the same order, then
- A (AB+BA) is skew symmetric matrix.
- B (AB+BA) is always a diagonal matrix.
- C (AB+BA) is a symmetric matrix.
- D (AB-BA) is a symmetric matrix.
Answer & Solution
Correct Answer
(C) (AB+BA) is a symmetric matrix.
Step-by-step Solution
Detailed explanation
Given \( A^T = A \) and \( B^T = B \) \( (AB+BA)^T = (AB)^T + (BA)^T \) \( = B^T A^T + A^T B^T \) \( = BA + AB \) \( = AB + BA \) Thus, \( (AB+BA)^T = AB+BA \) (AB+BA) is a symmetric matrix.
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