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The condition for which the eigenvalues of the matrix

$A=\begin{bmatrix} 2 & 1\\ 1 & k \end{bmatrix}$

are positive, is

  1. $k > 1/2$
  2. $k > −2$
  3. $k > 0$
  4. $k < −1/2$

 

 

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