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

\(k \in R\) ની કઈ કિમંત માટે આપેલ સમીકરણ સંહતિ  \(3 x-y+4 z=3\) ;  \(x+2 y-3 x=-2\)  ;   \(6 x+5 y+k z=-3\) ને અનંત ઉકેલ ધરાવે છે.

  1. A \(3\)
  2. B \(-3\)
  3. C \(5\)
  4. D \(-5\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(-5\)

Step-by-step Solution

Detailed explanation

\(\left|\begin{array}{ccc}3 & -1 & 4 \\ 1 & 2 & -3 \\ 6 & 5 & K\end{array}\right|=0\) \(\Rightarrow 3(2 \mathrm{~K}+15)+\mathrm{K}+18-28=0\) \(\Rightarrow 7 \mathrm{~K}+35=0 \Rightarrow \mathrm{K}-5\)
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