Let $A = \left( \begin{array} { c c } - 4 & - 9 \\4 & 8\end{array} \right)$

question 21

Multiple Choice

Let $A = \left( \begin{array} { c c } - 4 & - 9 \\4 & 8\end{array} \right)$ , and consider the system $X ^ { \prime } = A X$ . The critical point $( 0,0 )$ of the system is a

• A) stable node
• B) unstable node
• C) unstable saddle
• D) stable spiral point
• E) unstable spiral point

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