4MA0 Higher January 2014 Paper 3 Q19
19 Factorise completely \(\;(12x - y)^2 - (4x - 3y)^2\)
(2)
| Scheme | Marks |
|---|---|
| \(8(4x - y)(4x + y)\) | B2 |
| (2) | |
| (2 marks) |
Notes
B2: B2 for \(8(4x - y)(4x + y)\) oe
B1 for correct, incomplete factorisation eg \((16x - 4y)(8x + 2y)\) or eg \(8(16x^2 - y^2)\)
or correct use of difference of two squares eg. \((12x - y - (4x - 3y))(12x - y + 4x - 3y)\)