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

જો ગણ \(S\) એ \(\lambda \) ની વાસ્તવિક કિમંતોનો ગણ છે કે જેથી બિંદુઓ \(( - {\lambda ^2},1,1),(1, - {\lambda ^2},1)\) , \((1,1, - {\lambda ^2})\) અને \((-1, -1, 1)\) એ એકજ સમતલ પર આવેલ હોય તો \(S\) મેળવો.

  1. A \(\{ \sqrt 3 \} \)
  2. B \(\{ \sqrt 3 ,-\sqrt 3 \} \)
  3. C \(\{ 1, - 1\} \)
  4. D \(\{ 3, - 3\} \)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\{ \sqrt 3 ,-\sqrt 3 \} \)

Step-by-step Solution

Detailed explanation

All four points are coplanar so \(\left| {\begin{array}{*{20}{c}} {1 - {\lambda ^2}}&2&0\\ 2&{ - {\lambda ^2} + 1}&0\\ 2&2&{ - {\lambda ^2} - 1} \end{array}} \right| = 0\) \(\left(\lambda^{2}+1\right)^{2}\left(3-\lambda^{2}\right)=0\) \(\lambda=\pm \sqrt{3}\)
Same subject
Explore more questions on app