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

यदि बिंदु \((1,1, \lambda)\) तथा \((-3,0,1)\) समतल \(3 x+4 y-12 z+13=0\) से समदूरस्थ हैं, तो \(\lambda\), निम्न समीकरण को संतुष्ट करता है

  1. A \(3x^2 +10x - 13 =0\)
  2. B \(3x^2 -10x+21=0\)
  3. C \(3x^2 - 10x+7 =0\)
  4. D \(3x^2+10x - 7=0\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(3x^2 - 10x+7 =0\)

Step-by-step Solution

Detailed explanation

\(|3+4-12 \lambda+13|=|-9+0-12+13|\) \(\Rightarrow|-12 \lambda+20|=|8|\) \(\Rightarrow|3 \lambda-5|=2\) \(\Rightarrow 9 \lambda^{2}+25-30 \lambda=4\) \(\Rightarrow 9 \lambda^{2}-30 \lambda+21=0\) \(\Rightarrow 3 \lambda^{2}-10 \lambda+7=0\)
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