4400 Higher November 2007 Paper 3 Q13
13 Factorise
(a) \(x^2 - 100\) (1)
(b) \(x^2 - x - 12\) (2)
(c) \(3x^2 + 7x + 2\) (2)
| Scheme | Marks |
|---|---|
| \((x + 10)(x - 10)\) | B1 |
| (1) |
Notes
B1: or \((x - 10)(x + 10)\) ignore “solutions”
| Scheme | Marks |
|---|---|
| \((x \pm 4)(x \pm 3)\) | M1 |
| \((x - 4)(x + 3)\) | A1 |
| (2) |
Notes
A1: ignore “solutions”
| Scheme | Marks |
|---|---|
| \((3x\ldots)(x\ldots)\) or \((\ldots + 1)(\ldots + 2)\) | M1 |
| \((3x + 1)(x + 2)\) | A1 |
| (2) | |
| (5 marks) |
Notes
A1: ignore “solutions”