A scientist records the number of microorganisms in a culture each hour. The first five results form a quadratic sequence.
5 12 25 44 69
Find an expression, in terms of nnn, for the n n\,nth term of this sequence.
Practise OCR GCSE Maths The Nth Term of a Quadratic Sequence with exam-style questions for Foundation and Higher tier. 48 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.