Here are the first 5 terms of a quadratic sequence.
-2 -1 1 4 8
Verify that the n n\,nth term of this sequence is 0.5n2−0.5n−20.5n^2 - 0.5n - 20.5n2−0.5n−2.
201 exam-style questions on Eduqas GCSE Maths The Nth Term of a Quadratic Sequence. Each one has a worked solution and a mark scheme showing where the marks go.