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Question

The conjugate of the complex number (2+3i)4i is _____.


A
3+2i4
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B
32i4
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C
2i34
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D
2i32
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Solution

The correct option is A 3+2i4
Let z = 2+3i4i × 4i4i
= 8i1216 = 14(2i - 3)
= 14(3 - 2i)
Conjugate ¯¯¯z = 14(3 + 2i)

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