A continuous time LTI system is describe by `(d^2y(t))/(dt^2)` + `4(dy(t))/(dt)` + 3y(t) = `2(dx(t))/(dt)` + 4x(t)
Assuming zero initial conditions, the response y(t) of the above system for the input x(t) = e-2u u(t) is given by
(et - eet) u(t)
(e-t - e-3t) u(t)
(e-t + e-3t) u(t)
(et + e3t) u(t)