A) 16
B) \[-4\]
C) 4
D) \[-8\]
Correct Answer: B
Solution :
Vectors are coplanar if \[\left| \begin{matrix} 2 & -1 & 1 \\ 1 & 2 & -3 \\ 3 & p & 5 \\ \end{matrix} \right|=0\] \[2(10+3p)+1(5+9)+1(p-6)=0\] \[20+6p+5+9+p-6=0\] \[7p+34-6=0\] \[7p+28=0\] \[7p=-28\] \[p=-\frac{28}{7}=-4\]You need to login to perform this action.
You will be redirected in
3 sec