need answer for x(t)

A mass m = 4 kg is attached to both a spring with spring constant k = 257 N/m and a dash-pot with damping constant c = 4 N . s/m. The mass is started in motion with initial position co = 3 m and initial velocity vo = 3 m/s. Determine the position function (t) in meters. I(t) = Note that, in this problem, the motion of the spring is underdamped, therefore the solution can be written in the form I(t) = Cje Pecos(wit - o). Determine C1, w1 ,Quand p. C1 = W = (assume 0