The given differential equation is a model of an undamped spring/mass system in which the restoring force F(x) in (1)` d2x m +F(x) dt² = 0, (1) is nonlinear. For the equation below use a numerical solver to plot the solution curves that satisfy the given initial conditions. d²x 3 dt² +x³ = 0, x(0) = 1, x'(0) = 1; x(0) = '(0)=-1