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JEE Mains · Maths · STD 12 - 11. three dimension geometry

સમતલ \(2 x-y+z=4\) એ બિંદુઆ \(A (a,-2,4)\) અને \(B (2, b,-3)\) ને જોડતા રેખાખંડને \(C\) આગળ \(2:1\) ગુણોત્તરમાં છેદે છે અને બિંદુ તે ઉગમબિંદુથી અંતર \(\sqrt{5}\) છે. જો \(a b < 0\) અને \((a-b, b, 2 b-a)\) હોય, તો \(CP ^2=.............\)

  1. A \(\frac{17}{3}\)
  2. B \(\frac{16}{3}\)
  3. C \(\frac{73}{3}\)
  4. D \(\frac{97}{3}\)
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Answer & Solution

Correct Answer

(A) \(\frac{17}{3}\)

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Detailed explanation

\(A ( a ,-2,4), B (2, b ,-3)\) \(AC : CB =2: 1\) \(\Rightarrow C \equiv\left(\frac{ a +4}{3}, \frac{2 b -2}{3}, \frac{-2}{3}\right)\) \(C\) lies on \(2 x-y+2=4\) \(\Rightarrow \frac{2 a+8}{3}-\frac{2 b-2}{3}-\frac{2}{3}=4\) \(\Rightarrow a-b=2 \ldots(1)\)…
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