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Question

If a×b=b×c0withac then show that a+c=kb, where k is scalar.

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Solution

a×b=b×c

a×b=c×b

a×b=c×b=0

(a+c)×b=0

a×b0,b×c0,a,b,c are non-zero vectors. (a+c)0

Hence, a+c is parallel to b.

a+c=kb


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