If a=i-j+k, b=2i-3j+k, c=3i-5j+2k. The magnitude of the vector which is parallel to 2a+3b-4c is?

Asked by SUHAS MELMURI | 26th Apr, 2014, 08:13: AM

Expert Answer:

2 a plus 3 b minus 4 c equals 2 open parentheses i plus j plus k close parentheses plus 3 open parentheses 2 i plus 3 j plus k close parentheses minus 4 open parentheses 3 i plus 5 j plus 2 k close parentheses  2 a plus 3 b minus 4 c equals minus 4 i minus 9 j minus 3 k  open vertical bar 2 a plus 3 b minus 4 c close vertical bar equals square root of 4 squared plus 9 squared plus 3 squared end root equals square root of 106

Answered by  | 26th Apr, 2014, 11:29: AM

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