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Question

Let a=^j^k;c=^i^j^k. Then vector b satisfying a×b+c=0 and a.b=3

A
2^i^j+2^k
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B
^i^j2^k
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C
^i+^j+2^k
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D
^i+^j2^k
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Solution

The correct option is D ^i+^j2^k
Let b=a^i+b^j+c^k;a×b+c=0b+c+1=0,a=1;
a.b=3bc=3a=1,b=1,c=2b=1^i+1^j2^k

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