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-- Mathematics - Section A
Matrices
If $\begin{bmatrix} 2 & 3\\5 & 7\end{bmatrix}\begin{bmatrix} 1 & -3\\-2 & 4\end{bmatrix}=\begin{bmatrix}-4 & 6 \\-9 & x \end{bmatrix}$, then the value of x is :
13
-13
9
5