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

\(\alpha, \beta \in R\) માટે, ધારો કે સુરેખ સમીકરણ સંહતિ  \(x-y+z=5\) ; \(2 x+2 y+\alpha z=8\) ; \(3 x-y+4 z=\beta\) ને અસંખ્ય ઉકેલો છે. તો \(\alpha\) અને \(\beta\) એ \(........\) ના બીજ છે.

  1. A \(x ^2-10 x +16=0\)
  2. B \(x^2+18 x+56=0\)
  3. C \(x^2-18 x+56=0\)
  4. D \(x^2+14 x+24=0\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(x^2-18 x+56=0\)

Step-by-step Solution

Detailed explanation

\(\begin{array}{l}\left|\begin{array}{ccc}1 & -1 & 1 \\ 2 & 2 & \alpha \\ 3 & -1 & 4\end{array}\right|=0 ; 8+\alpha-2(-4+1)+3(-\alpha-2)=0 \\ 8+\alpha+6-3 \alpha-6=0 \\ \alpha=4\end{array}\)
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app