AQA GCSE Mathematics · 8300
Specification N8 · Paper 1, Paper 2, Paper 3
One of a pair of two-term expressions differing only in the sign between their terms, such as and .
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GCSE Mathematics · key term
One of a pair of expressions that differ only in the sign between two terms, such as and .
Specification N8 · Paper 1, Paper 2, Paper 3
One of a pair of two-term expressions differing only in the sign between their terms, such as and .
When using a conjugate, change only the sign between the two terms: the conjugate of is .
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Used by AQA, Edexcel and OCR
Specification A4 · Paper 1, Paper 2, Paper 3
One of a pair of expressions, such as and , which differ only in the sign between their terms.
Specification 3.03b · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
Revise: Surd ManipulationThe same method works when the surd comes first or when both denominator terms contain coefficients: choose the conjugate by changing only the sign between the two terms.
When rationalising a two-term denominator, multiply by its conjugate and apply the multiplier to the whole numerator and denominator.
For a denominator such as , multiply by its conjugate , not merely by .