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

माना \([\lambda]\) महत्तम पूर्णांक \(\leq \lambda\) हैं। \(\lambda\) के सभी मानों, जिनके लिए रैखिक समीकरण निकाय \(x + y + z =4\), \(3 x +2 y +5 z =3,9 x +4 y +(28+[\lambda]) z =[\lambda]\) का हल है, का समुच्चय है

  1. A \({R}\)
  2. B \((-\infty,-9) \cup(-9, \infty)\)
  3. C \([-9,-8)\)
  4. D \((-\infty,-9) \cup[-8, \infty)\)
Verified Solution

Answer & Solution

Correct Answer

(A) \({R}\)

Step-by-step Solution

Detailed explanation

\(\left| {\begin{array}{*{20}{r}} 1&1&1\\ 3&2&2\\ 9&4&{28 + [\lambda ]} \end{array}} \right|\) \(=-24-[\lambda] +15=-[\lambda]-9\) if \([\lambda]+9 \neq 0\) then unique solution if \([\lambda]+9=0\) then \(\mathrm{D}_{1}=\mathrm{D}_{2}=\mathrm{D}_{3}=0\) so infinite solutions…
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