A) - 14
B) 2
C) 6
D) 7
Correct Answer: C
Solution :
\[\left| \,\begin{matrix} 4 & 1 \\ 2 & 1 \\ \end{matrix}\, \right|\,\left| \,\begin{matrix} 4 & 1 \\ 2 & 1 \\ \end{matrix}\, \right|=\left| \,\begin{matrix} 3 & 2 \\ 1 & x \\ \end{matrix}\, \right|-\left| \,\begin{matrix} x & 3 \\ -2 & 1 \\ \end{matrix}\, \right|\] \[=\left| \,\begin{matrix} 17 & 9 \\ 9 & 5 \\ \end{matrix}\, \right|=(3x-2)-(x+6)\] Þ \[85-81=2x-8\] Þ \[4+8=2x\]Þ \[x=6\].You need to login to perform this action.
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