Quadratic functions and equations in N(A)-Level Additional Mathematics (4051): completing the square to find the turning point and sketch the parabola, the discriminant and the nature of the roots, and solving quadratic inequalities

An N(A)-Level Additional Mathematics (4051) overview of quadratic functions and equations in the Algebra strand. How completing the square reveals the turning point and lets you sketch the parabola, how the discriminant decides the nature of the roots, and how to solve quadratic inequalities, with links to every dot point.