the function is dy/dy=y^2+3y+a and after using the quadratic formula, I get an equilibrium point of a=9/4. Now when I set up the phase diagrams, I have a<9/4, a=9/4, and a>9/4. I know that in the order I just described they will have 2 roots, 1 root, and no roots. The problem I am having is drawing the direction of the arrows. Am I picking points and plugging them into the quadratic formula? If anyone can clarify this step, it would be much appreciated.