Topic explanation

Standard explanation

(x-2)(x-5)>=0 includes 2 and 5: (-inf,2] U [5, inf) if a>0. A square bracket is a filled circle. Round is open.

Key points

• = sits in the solution
• closed includes the root
• U for two pieces
• keep the ideas separate
• Endpoints: (x-2)(x-5)>=0 includes 2 and 5: (-inf,2] U [5, inf) if a>0. A square bracket is a filled circle. Rou
• WHAT — ENDPOINTS: (x-2)(x-5)>=0 includes 2 and 5: (-inf,2] U [5, inf) if a>0. A square bracket is a filled circle. Rou
• HOW — Use the idea: Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check
• CORE UNDERSTANDING: (x-2)(x-5)>=0 includes 2 and 5: (-inf,2] U [5, inf) if a>0. A square bracket is a filled circle. Rou

Labelled diagram