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CIE A Level Maths: Pure 1復(fù)習(xí)筆記1.1.3 Discriminants

Category: A-level課程, 教材筆記, 福利干貨 Date: 2022年8月18日 下午5:16

Discriminants

What is a discriminant?

How does the discriminant affect graphs and roots?

There are three options for the outcome of the discriminant:

2.2.2-Discrimamts-Notes-Diagram-2

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

2.2.2-Discrimamts-Notes-Diagram-3

Exam Tip

Worked Example

2.2.2-Discriminants-Example-Diagram

 

 

 

 

 

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