The orginial equation to solve is : x" + F(x) = sin 4t

initial conditions : x(0) = 0, x'(0) =1;

F(x) = { bx, x>= 0 and ax, x<0}

I need to do three different values for b = 1, a = 4, then b = 64, a = 4, finially  b = 36, a = 25,

Thanks for any insite I am new to the program.

Courtney