How to complete the square.
How to find the vertex of a parabola.
How to solve quadratic equations using square roots.
How to derive the quadratic formula by completing the square.
How to solve an equation with a square root.
How to know when to include a plus and minus on a square root problem.
How to know which method to use when solving a quadratic equation.
How to know when to include a absolute value when simplifying a square root.
How to define factorial expressions used in the binomial theorem.
How to define an imaginary number.