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

સુરેખ સમીકરણ સંહતિ \(7 x+11 y+\alpha z=13\) \(5 x+4 y+7 z=\beta\) \(175 x+194 y+57 z=361\) ને અસંખ્ય ઉકેલો હોય,તો \(\alpha+\beta+2=..............\)

  1. A \(4\)
  2. B \(3\)
  3. C \(5\)
  4. D \(6\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(4\)

Step-by-step Solution

Detailed explanation

Sol. \(7 x+11 y+\alpha z=13\) \(5 x+4 y+7 z=\beta\) \(175 x+194 y+57 z=361\) \(\text { (i) } \times 10+(\text { ii }) \times 21-(\text { iii) }\) \(z (10 \alpha+147-57)=130+21 \beta-361\) \(\therefore 10 \alpha+90=0\) \(\alpha=-9\) \(130-361+21 \beta=0\) \(\beta=11\)…
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