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Question

The conjugate of (4+5i)2 is

A
940i
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B
9+40i
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C
940i
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D
9+40i
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Solution

The correct option is A 940i
Let z=(4+5i)2
Now,
z=42+(5i)2+40iz=1625+40iz=9+40i¯¯¯z=940i

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