Multiple Choice Questions on Write down the conjugate of 2 3i 2 ........ for NDA Exam Preparation

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Multiple Choice Questions

Write down the conjugate of 2 3i 2 ........

Mathematics (NDA) Complex Numbers
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    Write down the conjugate of ( 2 + 3i)2?

     5 -12i

    Incorrect Answer

    5 +12i

    Incorrect Answer

     -5 +12i

    Incorrect Answer

     -5 -12i

    Correct Answer
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    Explanation:

     z = (2 + 3i)2

     = ( 4 + 9i2+12i)

    = (4 – 9 + 12i)

    = ( -5 + 12i)

    Therefore , z’ = ( -5 - 12i)

    By: bhavesh kumar singh
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