In the video, a woman is standing in front of a blackboard, writing a mathematical equation. She is wearing a white shirt and has long black hair. The blackboard has the equation "2^2 - 4^2 = 4^2" written on it. The woman is pointing to the equation and appears to be explaining it. There is a man sitting in front of the blackboard, facing the woman, and he is wearing a blue shirt. The video is shot in a classroom setting, and the lighting is dim.