4MA0 Higher January 2013 Paper 4 Q8
8
(a) Factorise \(n^2 + 8n\) (2)
(b) Expand and simplify \(3(2x - 5) - 4(x + 3)\) (2)
(c) Expand and simplify \((y + 7)(y + 2)\) (2)
| Scheme | Marks |
|---|---|
| \(n(n + 8)\) | B2 |
| (2) |
Notes
B2: Award B2 also for \((n \pm 0)(n + 8)\)
B1 for factors which, when expanded & simplified, give two terms, one of which is correct
SC B1 for \(n(n + 8n)\)
| Scheme | Marks |
|---|---|
| \(6x - 15 - 4x - 12\) | M1 |
| \(2x - 27\) | A1 |
| (2) |
Notes
M1: for 3 correct terms
A1: cao
| Scheme | Marks |
|---|---|
| \(y^2 + 2y + 7y + 14\) | M1 |
| \(y^2 + 9y + 14\) | A1 |
| (2) |
Notes
M1: for 3 correct terms out of 4
or for 4 correct terms ignoring signs
or for \(y^2 + 9y + c\) for any non-zero value of \(c\)
or for \(\ldots + 9y + 14\)
A1: cao