Edexcel GCSE Mathematics · 1MA1
Specification A24, A25 · Paper 1, Paper 2, Paper 3
Revise: Quadratic SequencesQuadratic sequences do not have a constant first difference. Instead, their second differences are constant.
- Revise: Nth Term
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GCSE Mathematics · key term
The difference between consecutive first differences.
Used by Edexcel
Specification A24, A25 · Paper 1, Paper 2, Paper 3
Revise: Quadratic SequencesQuadratic sequences do not have a constant first difference. Instead, their second differences are constant.
Lay out first and second differences carefully; most errors come from subtracting in the wrong order or misaligning the rows.
A constant first difference indicates an arithmetic sequence. For a quadratic sequence, the first differences change but the second differences are constant.
The coefficient of is half the constant second difference, including when the second difference is negative.
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