👉 Learn how to graph quadratic equations by completing the square. A quadratic equation is an equation of the form y = ax^2 ...

👉 Learn about the parts of a parabola. A parabola is the shape of the graph of a quadratic equation. A regular parabola is ...

Off-axis paraboloid reflector is a special optical element, its main function is to focus the incident light to a certain distance from the optical axis. The working principle is based on the ...