Higher November 2024 Paper 1 Q18
18
(a) Express \(\quad x^2 + 8x - 5 \quad\) in the form \(\quad (x + a)^2 - b \quad\) where \(a\) and \(b\) are integers. [2 marks]
(b) A curve has the equation \(\quad y = (x - 7)^2 + 8\)
Write down the coordinates of the turning point of the curve. [2 marks]
| Answer | Mark | Comments |
|---|---|---|
| \((x + 4)^2 - 21\) | B2 | condone \(a = 4\) and \(b = 21\) B1 \((x + 4)^2 \ldots\) or \(a = 4\) |
Additional guidance
| Ignore further work after a correct answer eg \((x + 4)^2 - 21\) followed by \(a = 4\) and \(b = -21\) | B2 |
| Answer | Mark | Comments |
|---|---|---|
| (7, 8) | B2 | B1 for each coordinate |