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

જો સમીકરણો \(x_1 + 2x_2 + 3x_3 = 6\) ; \(x_1 + 3x_2 + 5x_3 = 9\) ; \(2x_1 + 5x_2 + ax_3 = b\) એ સુસંગત અને અનંત ઉકેલ ધરાવે છે તો  . . .

  1. A \(a = 8,\,b\) કોઈ પણ વાસ્તવિક કિમત
  2. B \(b = 15,\,a\) કોઈ પણ વાસ્તવિક કિમત
  3. C \(a \in R - \{8\}\) અને \(b \in R- \{15\}\)
  4. D \(a = 8,\,b = 15\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(a = 8,\,b = 15\)

Step-by-step Solution

Detailed explanation

Given system of equations can written in matrix form as \(AX=B\) where \(A = \left( {\begin{array}{*{20}{c}} 1&2&3\\ 1&3&5\\ 2&5&a \end{array}} \right)\) and \(B = \left( {\begin{array}{*{20}{c}} 6\\ 9\\ b \end{array}} \right)\) Since, system is consistent and has infonitely…
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