Y = C1ex + C2e-5x is the general solution of a second order linear differential equation. The equation is: y?? - 4y? - 5y = 0 y?? - 4y? - 4y = 0 y?? + 4y? - 5y = 0 y?? + 4y? + 5y = 0 None of the above. Y= xe-3x is a solution of a second order liner differential equation with constant coefficients. The equation is: y?? - 6y? + 9y = 0 y?? + 3y? = 0 y?? + 6y? + 9y = 0 y?? - 6y? - 9y = 0 None of the above.