In the video, a person is writing on a piece of paper with a blue pen. The person is writing a mathematical equation. The equation appears to be a quadratic equation. The person is writing the equation in a clear and legible manner. The video is shot in a close-up shot, focusing on the person's hand and the paper. The person's hand is steady, and the pen moves smoothly across the paper. The video is shot in a well-lit room, and the sound of the pen on the paper can be heard. The person's hand is visible, and the person appears to be right-handed. The person's fingernails are short and clean. The paper is a standard white sheet of paper, and the pen is a blue ballpoint pen. The video is shot in a vertical orientation, and the camera is steady. The video ends with the person finishing the equation.