November 2021 Paper 1 Q17
17 Here is the graph of \(\quad y = x^2 - 6x + 5 \quad\) for values of \(x\) between 0 and 6

By drawing a suitable linear graph on the grid, work out approximate solutions to
\[x^2 - 7x + 9 = 0\][3 marks]
| Answer | Mark | Comments |
|---|---|---|
| \(x - 4\) or \(4 - x\) seen in working | M1 | from a subtraction of the quadratic and linear |
| \(y = x - 4\) drawn | A1 | |
| 5.3 and 1.7 and \(y = x - 4\) drawn | A1 | Allow [5.2, 5.4] and [1.6, 1.8] |
Additional guidance
| Solutions with correct graph not seen eg from formula Solutions from quadratic graph drawn | M0A0A0 M0A0A0 |