Foundation November 2017 Paper 3 Q28
28 Multiply out and simplify \(\qquad (x - 8)^2\) [2 marks]
| Answer | Mark | Comments |
|---|---|---|
| \(x^2 - 8x - 8x + 64\) | M1 | allow one error or omission terms may be seen in a grid |
| \(x^2 - 16x + 64\) | A1 | Ignore fw eg if attempting to solve Do not ignore fw if attempting to simplify |
Additional guidance
| \(x^2 - 16x\) (+ k) k \(\ne\) 64 | M1A0 |
| \(x^2 - 8x + 64\) | M1A0 |
| \(x^2 - 16x + 64 = -15x^3 + 64\) | M1A0 |
| \(x^2 - 8x + 8x + 64\) (one error) | M1A0 |
| \(x^2 + 8x + 8x + 64\) (one error) | M1A0 |
| \(x^2 - 6x + 8x + 64\) (two errors) | M0A0 |
| \(x^2 + 64\) (two errors) | M0A0 |