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Find the magnitude of the vector vec(PQ)...

Find the magnitude of the vector `vec(PQ)`, its scalar components and the component vectors along the co-ordinate axes, if P and Q have the co-ordinates
P(1,4,-), Q(2,-2,-1)

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`vec(PQ) = (2-1)hati+(-2-4)hatj+(-1+3)hatk`
= `hati-6hatj+2hatk`
`|vec(PQ)| = sqrt(1+36+4) = sqrt(41)`
Scalar components are 1, -6, 2.
Vectors components are `hati, -6hatj, 2hatk`
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