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Question

( z + a ) ( ¯¯¯z+a) , where a is real , is equivalent to : 



A

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B

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C

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D

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Solution

The correct option is D


z¯¯¯z=|z|2 

So ( z +a ) ( ¯¯¯z+a) = (z +a ) ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯(z+a)=|z+a|2  


Mathematics

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