Quadratic Sequences GCSE Maths
Quadratic sequences are sequences where the first differences are not constant, but the second differences are constant.
Example Pattern
For 2, 6, 12, 20, the first differences are 4, 6, 8. The second differences are 2 and 2, so the sequence is quadratic.
Exam tip: Write the differences neatly underneath the sequence so the pattern is easy to see.
Common mistake: Students sometimes assume every sequence must have a constant first difference.
Video explanation
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