Answer :

Formula: -




(iii) Three vectors a ,b , and c are coplanar if and only if a.(b×c) = 0



let position vector of



position vector of



position vector of



position vector of



The four points are coplanar if the vector are coplanar







1(9) – (x – 2)( – 2 + 9) + 4(3) = 0


9 – 7x + 14 + 12 = 0


35 = 7x


x = 5


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