સમીકરણ $\left| {\begin{array}{*{20}{c}}
x&{ - 6}&{ - 1}\\
2&{ - 3x}&{x - 3}\\
{ - 3}&{2x}&{x = 2}
\end{array}} \right| = 0$ ના વાસ્તવિક બીજનો સરવાળો મેળવો.
  • A$-4$
  • B$0$
  • C$6$
  • D$1$
JEE MAIN 2019, Difficult
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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 $=0$

art

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