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Determine that vector which when added t...

Determine that vector which when added to the resultant of `vecP=2hati+7hatj-10hatk` and `vecQ=hati+2hatj+3hatk` gives a unit vector along X-axis.

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Resulatnat `vecR=vecP + vecQ= (2hati+7hatj-10hatk)+ (hati+2hatj+3hatk)= 3hati+9hatj-7hatk`
But `vecR` + required vector = `hati` so required vector `=hati- vec R =hati- (3hati+9hatj-7hatk)=-2hati-9hatj+7hatk`
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