Higher November 2017 Paper 2 Q16
16 Solve \((x - 2)^2 = 3\)
Give your solutions correct to 3 significant figures. (2)
| Working | Answer | Mark | Notes |
|---|---|---|---|
| \(\dfrac{--4 \pm \sqrt{(-4)^2 - 4 \times 1 \times 1}}{2 \times 1}\) | 0.268, 3.73 | M1 | for \(x - 2 = \pm\sqrt{3}\) oe or one solution or use of \(x^2 - 4x + 1 = 0\) to substitute into formula (allow one error in substitution) |
| A1 | 0.267 – 0.27, 3.7 – 3.74 |