The Eigenvalues of the Matrix $A = \left( \begin{array} { c c } 1 & - 2 \\1 & 4\end{array} \right)$

Multiple Choice

The eigenvalues of the matrix $A = \left( \begin{array} { c c } 1 & - 2 \\1 & 4\end{array} \right)$ are

A) $( 5 \pm \sqrt { 17 } ) / 2$
B) $( - 5 \pm \sqrt { 17 } ) / 2$
C) 1, 2
D) 2, 3
E) 2, 2