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What is the value of k so that determinant \begin{vmatrix} 3k &9 \\ 1 & k \end{vmatrix} = 0?

  • Option 1)

    3

  • Option 2)

    -3

  • Option 3)

    \pm3

  • Option 4)

    None of these.

 

Answers (1)

best_answer

As we have learnt,

 

Value of determinants of order 2 -

-

 

Value \Rightarrow 3k^2 - 9 = 0 \Rightarrow k^2 -3 =0\Rightarrow k = \pm\sqrt3

 


Option 1)

3

Option 2)

-3

Option 3)

\pm3

Option 4)

None of these.

Posted by

gaurav

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