Here are the first 5 terms of a quadratic sequence.
-2 12 30 52 78
Show that the n n\,nth term is 2n2+8n−122n^2 + 8n - 122n2+8n−12
Hence, determine whether 268 is a term in the sequence.
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.