differential equations

Use a computer algebra system to draw a direction field for the differential equation y ' = 4y 3 - 100y. Get a printout and sketch on it solutions that satisfy the initial condition y(0) = c for various values of c. For what values of c does the limit L, given below, exist? L=Eylll GEIEIEI What are the possible values, L for this limit? (Enter solutions from smallest to largest. If there are any unused answer boxes, enter NONE in the last boxes.)