Answer :

Formula: -






Given: -


AB = position vector of B - position vector of A



AC = position vector of c - position vector of A



AD = position vector of c - position vector of A



The four pint are coplanar if the vector are coplanar.


thus,



now, using



= 4(16 - 4) + 2( - 8 - 4) - 2( - 4 + 8) = 0


hence proved.


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