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Let A be the matrix [3−41−1]\begin{bmatrix} 3 & -4 \\ 1 & -1 \end{bmatrix}. If A is expressed as the sum of P and Q, where P is a symmetric and Q is a skew symmetric matrix, then which of the following options define P and Q correctly?

Solution

✅ Correct Option: 1

P=12(A+AT)=[3−32−32−1]P = \frac{1}{2}(A + A^T) = \begin{bmatrix} 3 & -\frac{3}{2} \\ -\frac{3}{2} & -1 \end{bmatrix} and Q=12(A−AT)=[0−52520]Q = \frac{1}{2}(A - A^T) = \begin{bmatrix} 0 & -\frac{5}{2} \\ \frac{5}{2} & 0 \end{bmatrix}. Their sum returns A, with P symmetric and Q skew-symmetric.

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