Higher January 2021 Paper 1R Q6
6
(a) Make \(c\) the subject of \(A = \dfrac{c}{y} - 5z\) (2)
(b) Write down the value of \(g^0\) (1)
(c) Factorise \(x^2 - 11x + 24\) (2)
| Scheme | Marks |
|---|---|
e.g. \(A + 5z = \dfrac{c}{y}\) oe or \(Ay = c - 5yz\) oe | M1 |
| Correct answer scores full marks (unless from obvious incorrect working) Answer: \(c = y(A + 5z)\) | A1 |
| (2) |
Notes
M1: for a correct first step e.g. add \(5z\) to both sides
or
multiply all terms by \(y\)
A1: oe
| Scheme | Marks |
|---|---|
| 1 | B1 |
| (1) |
| Scheme | Marks |
|---|---|
| \((x \pm 3)(x \pm 8)\) | M1 |
| Correct answer scores full marks (unless from obvious incorrect working) Answer: \((x - 3)(x - 8)\) | A1 |
| (2) | |
| (5 marks) |
Notes
M1: or for \((x \pm a)(x \pm b)\) where \(ab = 24\) or \(a + b = -11\)