Higher November 2018 Paper 4 Q17
17 Here are the first four terms of a quadratic sequence.
2 15 34 59
The \(n\)th term is \(an^2 + bn + c\).
Find the values of \(a\), \(b\) and \(c\). [4]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| [\(a =\)] 3 [\(b =\)] 4 [\(c =\)] –5 | 4 | B2 for \(a = 3\) or M1 for second differences = 6 M1 for revised terms of –1 3 7 11 or B1 for \(b = 4\) or \(c = -5\) | |