CUET · MATHS · PYQ PAPER 2025
Which of the following statements is/are true?
(A) \(B^T A B\) is a skew-symmetric matrix if \(A\) is symmetric matrix
(B) \(B^T A B\) is a symmetric matrix if \(A\) is symmetric matrix
(C) \(B^T A B\) is a symmetric matrix if \(A\) is skew-symmetric matrix
(D) \(B^T A B\) is a skew-symmetric matrix if \(B\) is skew-symmetric matrix
(E) \(B^T A B\) is a symmetric matrix if \(B\) is symmetric matrix
Choose the correct answer from the options given below :
- A (A) and (C) only
- B (A) and (E) only
- C (B) only
- D (D) and (E) only
Answer & Solution
Correct Answer
(C) (B) only
Step-by-step Solution
Detailed explanation
Let \(X = B^T A B\). Then \(X^T = (B^T A B)^T = B^T A^T (B^T)^T = B^T A^T B\). If \(A\) is symmetric (\(A^T = A\)): \(X^T = B^T A B = X\). Thus, \(X\) is symmetric. Therefore, (A) is false and (B) is true. If \(A\) is skew-symmetric (\(A^T = -A\)):…
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