4400 Higher June 2009 Paper 4 Q3
3 Work out the value of \(\dfrac{a(b + 1)}{16}\) when \(a = 6\) and \(b = -9\)
(3)
| Scheme | Marks |
|---|---|
| \(6 \times (-9 + 1)\) or \(-8\) seen | M1 |
| \(-48\) or \(-54 + 6\) | M1 |
| \(-3\) | A1 |
| (3) | |
| (3 marks) |
Notes
M1: allow \(6 \times -9 + 1\)
M1: Accept \(6/(-2)\) or \((3/8) \times -8\)