4400 Higher November 2009 Paper 3 Q17
17
(a) Factorise \(x^2 - y^2\) (1)
(b) Factorise completely \((c + d)^2 - d^2\) (2)
(c) Factorise \(2w^2 + w - 3\) (2)
| Scheme | Marks |
|---|---|
| \((x - y)(x + y)\) | B1 |
| (1) |
| Scheme | Marks |
|---|---|
| \(c^2 + 2cd + d^2 - d^2\) | M1 |
| \(c(c + 2d)\) | A1 |
| (2) |
Notes
M1: Alt \((c + d + d)(c + d - d)\)
| Scheme | Marks |
|---|---|
| \((2w + 3)(w - 1)\) | B2 |
| (2) | |
| (5 marks) |
Notes
B2: B1 for 1 correct factor or \((2w - 3)(w + 1)\)
Integers only