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Question

If p equals 7 i minus 2 j plus 3 k and q equals 3 i plus j plus 5 k comma then the magnitude of p minus 2 q is

  1. square root of 29    
  2. 4    
  3. square root of 62 minus 2 square root of 35    
  4. square root of 66    

The correct answer is: square root of 66


    p minus 2 q equals i minus 4 j minus 7 k
    vertical line p minus 2 q vertical line equals square root of 49 plus 16 plus 1 end root equals square root of 66.

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