Higher June 2017 Unit 2 Q8
8.
(a) Factorise \(x^3 - 5x\). [1]
(b) Expand and simplify \((2x - 3)(x + 4)\). [2]
(c) Factorise \(x^2 - 3x - 28\). [2]
| Scheme | Marks | Comments |
|---|---|---|
| x(x2 − 5) | B1 |
| Scheme | Marks | Comments |
|---|---|---|
| 2x2 + 5x – 12 | B2 | B1 for 2x2 + kx – 12 OR 2x2 + 5x + k |
| Scheme | Marks | Comments |
|---|---|---|
| (x – 7)(x + 4) ISW | B2 | B1 for (x … 7)(x … 4). |