Q25 of 181 Page 1073

If and then prove that and are coplanar.




If are coplanar then = 0


L.H.S = - 2( - 8 - 4) + 2(4 + 8) + 4(4 - 16) = 24 + 24 - 48 = 0 = R.H.S


∴L.H.S = R.H.S


Hence proved that the vectors




Are coplanar.


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