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Math Help - direct computation

  1. #1
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    direct computation

    Show by direct computation that \mid (2 \overline{z}+5)( \sqrt{2} - i) \mid = \sqrt{3} \mid 2z+5 \mid
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  2. #2
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    Just note that |zw|=|z||w| and \overline{2\overline{z}+5}=2z+5.
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