4400 Higher June 2007 Paper 3 Q2
2
(a) Work out the value of \(x^2 - 5x\) when \(x = -3\) (2)
(b) Factorise \(x^2 - 5x\) (2)
| Scheme | Marks |
|---|---|
| \((-3)^2 - 5 \times -3\) | M1 |
| 24 | A1 |
| (2) |
Notes
M1: for substn or 9 or 15 seen
A1: cao
| Scheme | Marks |
|---|---|
| \(x(x - 5)\) | B2 |
| (2) | |
| (4 marks) |
Notes
B2: B1 for factors which, when expanded and simplified, give two terms, one of which is correct
SC B1 for \(x(5 - x)\) and for \(x(x - 5x)\)