Here are the first 5 terms of a quadratic sequence.
2 10 22 38 58
Find an expression, in terms of nnn, for the n n\,nth term of this sequence.
Hence, find the 20th term of the sequence.
201 exam-style questions on OCR GCSE Maths The Nth Term of a Quadratic Sequence. Each one has a worked solution and a mark scheme showing where the marks go.