Foundation November 2017 Paper 2 Q24
24
(a) Solve \(2x^2 = 72\) (2)
(b) Expand and simplify \((2x + 1)(3x - 2)\) (2)
(c) Factorise \(x^2 + 6x + 9\) (1)
| Answer | Mark | Notes |
|---|---|---|
| \(\pm 6\) | M1 | for one value (6 or \(-6\)) or \(\sqrt{36}\) or an embedded answer eg \(2 \times 6^2 = 72\) |
| A1 | \(\pm 6\) |
| Working | Answer | Mark | Notes |
|---|---|---|---|
| \(6x^2 - 4x + 3x - 2\) | \(6x^2 - x - 2\) | M1 | for at least 3 terms correct out of a maximum of 4 from expansion, or 4 terms correct ignoring signs. |
| A1 | cao |
| Answer | Mark | Notes |
|---|---|---|
| \((x + 3)^2\) | B1 | for \((x + 3)^2\) or \((x + 3)(x + 3)\) |