Higher June 2025 Paper 5 Q15
15
(a) Write \(x^2 - 6x + 5\) in the form \((x - a)^2 - b\). [3]
(b) Write down the coordinates of the turning point of \(y = x^2 - 6x + 5\). [2]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| \((x - 3)^2 - 4\) final answer | 3 | B1 for \((x - 3)^2\) B2FT for [+] 5 – (their (a))\(^2\) correctly evaluated after (\(x\) – their a)\(^2\) shown or M1 for [+] 5 – (their (a))\(^2\) shown If 0 scored, SC2 for final answer \((x - 3) - 4\) | FT can be implied eg answer \((x - 6)^2 - 31\) gets B2FT |
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| (3, –4) | 2 | correct or FT their part (a) B1FT for one correct coordinate | Dep on their part (a) in form \((x - a)^2 - b\) |