A) 16
B) \[-4\]
C) 4
D) \[-8\]
Correct Answer: B
Solution :
For coplanarity \[\left| \begin{matrix} 2 & -1 & 1 \\ 1 & 2 & -3 \\ 3 & P & 5 \\ \end{matrix} \right|=0\] \[2(10+3P)+1(5+9)+1(P-6)=0\] \[20+6P4-5+9+P-6=0\] \[7P+34-6=0\] \[7P+28=0\] \[7P=-28\] \[P=-\frac{28}{7}=-4\]You need to login to perform this action.
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