Multiple Choice Questions on If i 4i minus 6 10i and i 1 2i ........... for NDA Exam Preparation

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Multiple Choice Questions

If i 4i minus 6 10i and i 1 2i ...........

Mathematics (NDA) Complex Numbers
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    If  i = [ 4i − 6     10i ]  and  i = 1 / 2i ,  where i = √−1, then kA is equal to -

             [14i      6 + 4i ]

    [ 2 +3i        5  ]

    [ 7         2 −3i ]

    Correct Answer

    [ 2− 3i     5  ]

    [ 7       2+ 3i ]

    Incorrect Answer

    [ 2 −3i     7     ]

    [ 5         2 +3i ]

    Incorrect Answer

    [ 2+ 3i     5   ]

    [ 7       2+ 3i ]

    Incorrect Answer
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    Explanation:

    A = [ 4i − 6   10i    ] 

           [14i      6 + 4i ]

    = kA = [ -2-3i / -1       5 ] 

                [ 7        3i-2 / -1 ]

    = [ 2 + 3i      5]

        [7     2 − 3i ]

    By: Yachna
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