Conjugate
What Conjugate means in Mathematics GCSE, as defined for AQA, Pearson Edexcel.
Definitions of Conjugate
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
Check what you remember
Read the wording for your board, then hide it and explain Conjugate in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
For a two-term expression u + v, the matching expression u − v, or vice versa. For rationalising here, the sign between the root terms is reversed.
For a two-term surd expression such as a + √b, the conjugate is a − √b; multiplying them produces a² − b.
Topics that use Conjugate
- Structure and calculation (AQA GCSE)
- Algebra - Notation, vocabulary and manipulation (Pearson Edexcel GCSE)
Related terms
Using Conjugate in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Mathematics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge