CIE A Level Maths: Pure 1复习笔记1.1.3 Discriminants

What is a discriminant?

How does the discriminant affect graphs and roots?

There are three options for the outcome of the discriminant:

Discriminant and inequalities

• You need to be able to set up and solve equations and inequalities (often quadratic) arising from the discriminant
• Sketch the quadratic and decide whether you're looking above or below zero to write your solutions correctly