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If vecA=hati+2hatj=3hati-hatj+hatk and v...

If `vecA=hati+2hatj=3hati-hatj+hatk and vecC=hati+hatj-nhatk`, find ''n'' for the vectors to be coplanar.

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Using `vecC=pvecA+ vecB`, subsituting `vecA vecB and vecC` we have `p(hati+2hatj-3hatk)+q(3hati-hatj+hatk)=hati+hatj-n` equations we have `p=(4)/(7) and q=(1)/(7)` Substituting p and q in thrid equation , we have `n=(11)/(7)`
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