A linear second-order single-input continuous-time system is described by the following set of differential equations : X1 (t) = 2 X1 (t) + 4 X2 (t) X2 (t) = 2 X1 (t) X2 (t) + u (t) where X1 (t) and X2 (t) are the state variables and u (t) is the control variable. The system is

A linear second-order single-input continuous-time system is described

1.	A linear second-order single-input continuous-time system is described by the following set of differential equations : X1 (t) = 2 X1 (t) + 4 X2 (t) X2 (t) = 2 X1 (t) X2 (t) + u (t) where X1 (t) and X2 (t) are the state variables and u (t) is the control variable. The system is
A.	controllable and stable
B.	controllable but unstable
C.	uncontrollable and unstable
D.	uncontrollable but stable
Answer» C. uncontrollable and unstable

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A linear second-order single-input continuous-time system is described by the following set of differential equations : X1 (t) = 2 X1 (t) + 4 X2 (t) X2 (t) = 2 X1 (t) X2 (t) + u (t) where X1 (t) and X2 (t) are the state variables and u (t) is the control variable. The system is

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