Math small question, want answer in 2 hours

i want solution for this problem in maximum 2 hours from now :- give a linearization for the initial value problem x''(t)+0.1[1-x^2(t)]x'(t)+x(t)=0 x(0)= 0.4 , x'(0)=0 for x small. solve this linearized to obtain an approximation for the nonlinear problem