Higher November 2023 Paper 2 Q22
22 Factorise \(\quad 25a^2 - b^2\) [1 mark]
| Answer | Mark | Comments |
|---|---|---|
| \((5a + b)(5a - b)\) | B1 | brackets in either order |
Additional guidance
| Condone missing final bracket eg \((5a + b)(5a - b\) | B1 |
| Condone multiplication sign eg \((5a + b) \times (5a - b)\) | B1 |
| Accept \((-5a + b)(-5a - b)\) | B1 |