control systems

Among the following, the differential equation(s) not representative of a linear dynamical system is/are ______. (i) $\frac{d^2x}{dt^2} + 2t \frac{dx}{dt} + x(t) = u(t)$ (ii) $(\fr...

A linear time invariant (LTI) system is described by: $\begin{bmatrix} \dot{x}_1 \\ \dot{x}_2 \end{bmatrix} = \begin{bmatrix} 0 & 1 \\ -10 & -7 \end{bmatrix} \begin{bmatrix} x_1 \\...