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

समीकरण \(\left|\begin{array}{ccc}x & -6 & -1 \\ 2 & -3 x & x-3 \\ -3 & 2 x & x+2\end{array}\right|=0\), के वास्तविक मूलों का योगफल है

  1. A \(-4\)
  2. B \(0\)
  3. C \(6\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(0\)

Step-by-step Solution

Detailed explanation

By expansion, we get \( - 5{x^3} + 30x - 30 + 5x = 0\) \( \Rightarrow - 5{x^3} + 35x - 30 = 0\) \( \Rightarrow {x^3} - 7x + 6 = 0\), All roots srea real So, sum of roots \(=0\)
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