Q. 195.0( 1 Vote )

If four points A, B, C and D with position vectors and respectively are coplanar, then find the value of x.

Answer :

To Find: Find the value of x.


Explanation: We have four points,






If the points are coplanar then,









= 1[(0+9)]-(x-3)[-2+9]+4(3-0)=0


9-(x-3)(7)+12=0


9-(7x-12)+12=0


9-7x+21+12=0


-7x=-42



x=6


Hence, the value of x is 6


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