What are the eigen values of the following 2 2 matrix...

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What are the eigen values of the following 2 × 2 matrix?
\[\left[ {\begin{array}{*{20}{c}} 2&{ - 1} \\ { - 4}&5 \end{array}} \right]\]

A. -1 and 1

B. 1 and 6

C. 2 and 5

D. 4 and -1

Answer: Option B

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