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JEE Mains · Maths · STD 11 - 4.1 complex nubers

माना \(S =\{z \in C :|z-3| \leq 1 \text { and } z(4+3 i)+\bar{z}(4-3 i) \leq 24\} \text {. }\) यदि \(\alpha+i \beta, S\) में एक बिन्दु है जो \(4 i\) के निकटतम है, तो \(25(\alpha+\beta)\) बराबर होगा \(............\)

  1. A \(40\)
  2. B \(75\)
  3. C \(80\)
  4. D \(85\)
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Answer & Solution

Correct Answer

(C) \(80\)

Step-by-step Solution

Detailed explanation

\(|z-3| \leq 1\) represent pt. i/s circle of radius \(1\) centred at \((3,0)\) \(z(4+3 i)+\bar{z}(4-3 i) \leq 24\) \((x+i y)(4+3 i)+(x-i y)(4-3 i) \leq 24\) \(4 x+3 x i+4 i y-3 y+4 x-3 i x-4 i y-3 y \leq 24\) \(8 x-6 y \leq 24\) \(4 x-3 y \leq 12\) minimum of \((0,4)\) from…
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