A) \[-2\]
B) 2
C) 1
D) 3
Correct Answer: B
Solution :
Vectors \[\vec{i}+3\vec{j}-2\vec{k},\,-2\vec{i}-\vec{j}+4\vec{k}\]and \[3\vec{i}+2\vec{j}+x\vec{k}\] \[\left| \begin{matrix} 1 & 3 & -2 \\ 2 & -1 & 4 \\ 3 & 2 & x \\ \end{matrix} \right|=0\] \[1(-x-18)-3(2x-12)-2(4+3)=0\] \[-x-8-6x+36-8-6=0\Rightarrow -7x=-14\] \[x=2\]You need to login to perform this action.
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