A) \[\left[ \begin{matrix} 2 & 2 \\ 7 & 4 \\ \end{matrix} \right]\]
B) \[\left[ \begin{matrix} 1 & 2 \\ 7/2 & 2 \\ \end{matrix} \right]\]
C) \[\left[ \begin{matrix} 2 & 2 \\ 7/2 & 1 \\ \end{matrix} \right]\]
D) None of these
Correct Answer: C
Solution :
\[2X-\left[ \begin{matrix} 1 & 2 \\ 7 & 4 \\ \end{matrix} \right]\,=\,\left[ \begin{matrix} 3 & 2 \\ 0 & -2 \\ \end{matrix} \right]\] Þ \[2X=\left[ \begin{matrix} 3 & 2 \\ 0 & -2 \\ \end{matrix} \right]+\left[ \begin{matrix} 1 & 2 \\ 7 & 4 \\ \end{matrix} \right]\] Þ \[2X=\left[ \begin{matrix} 4 & 4 \\ 7 & 2 \\ \end{matrix} \right]\] Þ \[X=\left[ \begin{matrix} 2 & 2 \\ 7/2 & 1 \\ \end{matrix} \right]\].
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