Vectors 2 Question 21

21. If a,b,c,d are four distinct vectors satisfying the conditions a×b=c×d and a×c=b×d, then prove that ab+cdac+bd.

(2004, 2M)

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Solution:

  1. Given, a×b=c×d and a×c=b×d

a×ba×c=c×db×d

a×(bc)=(cb)×da×(bc)(cb)×d=0a×(bc)d×(bc)=0(ad)×(bc)=0(ad)|(bc)(ad)(bc)0ab+dcdb+ac



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