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Calculate the vector which has to be add...

Calculate the vector which has to be added to the resultant of `vecA=2hati-3hatj-4hatk and vecB=6hati-4hatj-4hatk` gives unit vector along x - direction.

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`vecA=2hati-3hatj-4hatk, vecB=6hati-4hatj-4hatk`
Sum of the two vectors `vecA and vecB` gives,
`vecA+vecB=(2hati-3hatj-4hatk)+(6hati-4hatj-4hatk)`
`=8hati-7hatj-8hatk`
Required vectors, `=hati-(8hati-7hatj-8hatk)`
`=-7hati+7hatj+8hatk`
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