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GCSE Mathematics · key term
The value put into a function.
Used by Edexcel and OCR
Specification A7 · Paper 1, Paper 2, Paper 3
A value supplied to a function before its rule is applied.
Revise: Introduction to Function NotationA function is a rule that gives exactly one output for each allowed input.
Specification 6.05a · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
Revise: Function NotationSuppose you know the output 13 and want to recover the input.
Do not read as : the brackets contain the input.
Distinguish carefully between , which asks for an output, and , which gives an output and asks you to find the input value or values.
When substituting a negative number or an expression, put the entire input in brackets before simplifying.
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