Well I would multiply every one of these terms by one minus P. So one P times one minus P would be one P times one minus P. You would get that right over there. What about two P times one minus P? What would that be equal to? Well that would be two P times one minus P and now we're going to multiply it by one minus P again so you're going to get one minus P squared. And so I think you see where this is going and we're just going to keep adding and adding and adding from there. So now we're going to do something really fun and interesting at least from a mathematical point of view. If this is equal to that, if the left hand side is equal to the right hand side, let's just subtract this value from both sides.