Boundary values are found by setting the quadratic expression equal to [ ].
the discriminant
infinity
one
zero
Flashcards for Edexcel GCSE Maths Quadratic Inequalities, covering the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3. 21 cards, matched to the Edexcel GCSE Maths (1MA1) specification.