Expand Mathematical Equation

Remember those times when we had to go for maths classes and everything was boring where you usually slept or let your mind wonder throughout the class?

Then comes the moment of truth when everyone must sit for the big "EXAM". So you burned some midnight oil in hopes that you will pass the paper.

But then, there always seems to be a question too hard to solve. What will you do when you encounter this kind of problem? Well just do what Peter did.