1. **State the problem:** Find the matrix \( A = \begin{bmatrix} 1 & 9 & 3 \\ 2 & 5 & 4 \\ 3 & 7 & 8 \end{bmatrix} \). 2. **Understanding the matrix:** This is a 3x3 matrix with elements given in rows and columns. 3. **No further operation specified:** Since the problem only asks to find or identify matrix \( A \), the answer is simply the matrix itself. 4. **Matrix representation:** $$ A = \begin{bmatrix} 1 & 9 & 3 \\ 2 & 5 & 4 \\ 3 & 7 & 8 \end{bmatrix} $$ This matrix can be used for further operations like determinant, inverse, or multiplication if needed. **Final answer:** $$ A = \begin{bmatrix} 1 & 9 & 3 \\ 2 & 5 & 4 \\ 3 & 7 & 8 \end{bmatrix} $$