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JEE Mains · Maths · STD 11 - 4.1 complex nubers

माना सभी सम्मिश्र संख्याओं का समुच्चय \(C\) है। माना \(S _{1}=\{ Z \in C :| Z -2| \leq 1\}\) तथा \(S _{2}=\{ Z \in C : Z (1+ i )+\overline{ Z }(1-i) \geq 4\}\) हैं। तो \(z \in S_{1} \cap S_{2}\) के लिए, \(\left|z-\frac{5}{2}\right|^{2}\) का अधिकतम मान बराबर है 

  1. A \(\frac{3+2 \sqrt{2}}{4}\)
  2. B \(\frac{5+2 \sqrt{2}}{2}\)
  3. C \(\frac{3+2 \sqrt{2}}{2}\)
  4. D \(\frac{5+2 \sqrt{2}}{4}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\frac{5+2 \sqrt{2}}{4}\)

Step-by-step Solution

Detailed explanation

\(\mathrm{S}_{1}:|\mathrm{z}-2| \leq 1\) \(\mathrm{~S}_{2}: \mathrm{x}(1+\mathrm{i})+\overline{\mathrm{z}}(1-\mathrm{i}) \geq 4\) \(z=x+i y\) \((x+i y)(1+i)+(x-i y)(1-i) \geq 4\) \(x+i(x+y)-y+x-i(x+y)-y \geq 4\) \(2 x-2 y \geq 4\) \(\Rightarrow y \leq x-2\) For…
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