Higher June 2022 Paper 6 Q7
7
(a) Multiply out and simplify.\[(x - 4)(x + 5)\]
[2]
(b) Factorise.\[x^2 - 25\]
[1]
| Answer | Marks | Part marks and guidance | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| \(x^2 + [1]x - 20\) final answer | 2 | M1 for at least three of \(x^2\), \([+]5x\), \(-4x\), \(-20\) | M1 may be seen in a table e.g.
M1 for \(x^2 + [1]x + {-20}\) Do not accept poor algebra e.g. \(x5\) for \(5x\) or \(x \times x\) for \(x^2\) | |||||||||
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| \((x - 5)(x + 5)\) final answer | 1 | Condone missing final bracket | |