Surd
What Surd means in Mathematics GCSE, as defined for AQA, Pearson Edexcel.
Definitions of Surd
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Reference: Pearson Edexcel
An irrational root expressed exactly, such as $\sqrt2$ or $\sqrt[3]{5}$. A root that simplifies to a rational number, such as $\sqrt{16}$, is not a surd.
An irrational root expressed in exact root form; in this guide, typically the square root of a positive integer that is not a perfect square.
An irrational root expressed exactly, such as √2 or √5. A square root that simplifies to a rational number, such as √4, is not a surd.
An irrational root expressed exactly, such as √3, rather than as a rounded decimal.
An irrational root left in exact form, for example √2 or √3.
An irrational root retained in exact form, such as √2.
Topics that use Surd
- Mensuration and calculation (AQA GCSE)
- Sequences (AQA GCSE)
- Structure and calculation (AQA GCSE)
- Algebra - Notation, vocabulary and manipulation (Pearson Edexcel GCSE)
- Geometry and measures - Mensuration and calculation (Pearson Edexcel GCSE)
- Number - Structure and calculation (Pearson Edexcel GCSE)
Related terms
Using Surd in the exam
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