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If vecA=4veci-2hatj+4hatk and vecB=-4hat...

If `vecA=4veci-2hatj+4hatk` and `vecB=-4hati+2hatj+alphahatk` are perpendicular to each other then find value of `(alpha)` ?

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`because vecA & vecB` are perpendicular to each other `therefore vecA. vecB=0rArr (4hati-2hatj+4hatk).(-4hati+2hatj+alpha hatk)=0`
`rArr-16-4+4alpha=0rArr alpha=5`
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