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vecA=(3hati+2hatj-6hatk) and vecB=(hati-...

`vecA=(3hati+2hatj-6hatk)` and `vecB=(hati-2hatj+hatk)`, find the scalar product `vecA` and `vecB`

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`vecA*vecB=(3hati+2hatj-6hatk)(hati-2hatj+hatk)`
`=3-4-6`
`=-7`
Hint. `vecA*vecB=A_(x)B_(x)+A_(y)B_(y)+A_(z)B_(z)`
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