A) \[\frac{-9}{2}\]
B) \[\frac{11}{2}\]
C) \[\frac{-11}{2}\]
D) \[\frac{15}{2}\]
Correct Answer: D
Solution :
We must have \[\left| \begin{matrix} 1 & (1-\alpha ) & -2 \\ 2 & 1 & 3 \\ 2 & 3 & 4 \\ \end{matrix} \right|=0\Rightarrow \alpha =\frac{15}{2}\]You need to login to perform this action.
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