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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

\(\lambda\) के उन वास्तविक मानों की संख्या जिनके लिए रैखिक समीकरण निकाय \(2 x+4 y-\lambda z=0\); \(4 x+\lambda y+2 z=0\); \(\lambda x+2 y+2 z=0\) के अनंत हल हैं

  1. A \(0\)
  2. B \(1\)
  3. C \(2\)
  4. D \(3\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(1\)

Step-by-step Solution

Detailed explanation

Since the given system of linear equations has infinitely many solutions. \(\therefore \begin{array}{*{20}{c}} 2&4&{ - \lambda }\\ 4&\lambda &2\\ \lambda &2&2 \end{array} = 0\) \( \Rightarrow {\lambda ^3} + 4\lambda - 40 = 0\) \(\lambda \) has only \(1\) real root.
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