Capital V will stand for Vbarr(molar volume) (P+(a/V^2))(V-b)=RT is the van der Waals equation and when it is solved for V you obtain cubic equation V^3-(b+(RT/P))V^2+(a/P)V-ab/P=0 Why is this and how is this calculation performed? How would you solve P=(RT/(V-b))-a/TV^2 for V?