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

यदि समतलों \(4 x-2 y-4 z+1=0\) तथा \(4 x-2 y-4 z+d=0\) के बीच की दूरी \(7\) , तो \(d\) है

  1. A \(41\) अथवा \(-42\)
  2. B \(42\) अथवा \(-43\)
  3. C \(-41\) अथवा \(43\)
  4. D \(-42\) अथवा \(44\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(-41\) अथवा \(43\)

Step-by-step Solution

Detailed explanation

Given planes are \(4 x-2 y-4 z+1=0\) and \(4 x-2 y-4 z+d=0\) They are parallel. Distance between them is \(\pm 7\) \(=\frac{d-1}{\sqrt{16+4+16}}\) \(\Rightarrow \frac{d-1}{6}=\pm 7\) \(\Rightarrow d=42+1\) or \(-42+1\) i.e. \(d=-41\) or 43.
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