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find |vec x| , if for a unit vector v...

find `|vec x|` , if for a unit vector `vec a, (vec x- vec a)( vec x + vec a)`=12

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The correct Answer is:
`a to r ; b to s ; c to q ; d to p`
`[veca xx vecb vecb xx vecc vecc xx veca]=36`
`or [veca vecb vecc]=6`
` Rightarrow` volume of terthedron formed by vectors.
`veca,vecb and vecc is 1/6 [ veca vecb vecc] =1`
`[veca +vecb vecb +vecc vecc +veca] =2 [veca vecb vecc] =12`
`veca-vecb,vecb-vecc and vecc-veca` are coplanar,
`Rightarrow [veca-vecb vecb -veccvecc-veca]=0`
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