A) 3
B) 5
C) 7
D) 9
Correct Answer: D
Solution :
We have \[\Delta =\left| \,\begin{matrix} 5 & 3 & -1 \\ -7 & x & -3 \\ 9 & 6 & -2 \\ \end{matrix}\, \right|\text{ }=\text{0}\] \[\therefore \] \[-10x+90-42-81+42+9x=0\,\,\text{or}\,\text{ }x=9\].
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