Higher November 2021 Paper 1 Q22
22 Find the coordinates of the turning point on the curve with equation \(y = 9 + 18x - 3x^2\)
You must show all your working. (4)
| Answer | Mark | Mark scheme |
|---|---|---|
| (3, 36) | P1 | for factorising \(-3\) from the expression, eg \(-3(x^2 - 6x - 3)\) or \(-3(x^2 - 6x) + 9\) |
| P1 | for starting the process to complete the square, eg \((x - 3)^2 - 9\) | |
| P1 | for completing the process of completing the square, eg \(-3[(x - 3)^2 - 12]\) or \(-3(x - 3)^2 + 36\) | |
| A1 | cao |
Additional guidance
ft from their factorising if only one error
An answer only and no working is 0 marks