IGCSE Maths / Quadratic equations, curves and inequalities

Quadratic inequalities

Edexcel International GCSE Maths (4MA1), chapter 22: Quadratic equations, curves and inequalities, specification point 2.8a. Part of the full course.

Read the revision notes · IGCSE Maths past papers

Quadratic inequalities are solved by finding where the quadratic equals zero, then using a sketch to choose the region where it is positive or negative. Show that region on a number line, using hollow circles for strict inequalities.

More lessons in Quadratic equations, curves and inequalities

• Solving quadratics by factorising
• Completing the square
• Completing the square with a negative coefficient
• Solving quadratics by completing the square
• The quadratic formula
• Forming quadratics from a context
• Drawing a quadratic curve
• Reading roots and the turning point from a curve