Higher November 2018 Paper 6 Q15
15 Use the formula \(x_{n+1} = \dfrac{(x_n)^3}{30} + 2\) with \(x_1 = 2\) to calculate \(x_2\) and \(x_3\).
Round your answers correct to 4 decimal places. [3]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 2.2667 and 2.3882 | 3 | B2 for 2.2667 or for 2.2666… or \(\dfrac{34}{15}\) and 2.388… or M1 for \(\dfrac{2^3}{30} + 2\) soi by 2.2666… or \(2.2\dot{6}\) or \(\dfrac{34}{15}\) | For 3 marks, answers must be on answer line or correctly identified as \(x_2\) and \(x_3\) |