Discriminant
What Discriminant means in Mathematics GCSE, as defined for Pearson Edexcel.
Definitions of Discriminant
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Reference: Pearson Edexcel
D = b² − 4ac. For real coefficients with a ≠ 0, D > 0 gives two distinct real roots, D = 0 a repeated root and D < 0 no real roots.
The expression b² − 4ac in the quadratic formula; its sign determines the number of real roots.
Topics that use Discriminant
- Algebra - Graphs (Pearson Edexcel GCSE)
- Algebra - Solving equations and inequalities (Pearson Edexcel GCSE)
Related terms
- completing the square
- monic quadratic
- Repeated root
- root
- Turning point
- x-intercept
- factorise
- Algebraic modelling of real-world situations
Using Discriminant in the exam
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