Higher June 2019 Paper 6 Q15
15 Solve by factorisation.
\[5x^2 + 7x + 2 = 0\][3]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| \((5x + 2)(x + 1)\) oe using two pairs of brackets | 2 | M1 for any two factors that give two correct terms when expanded or partial factorisation such as \(5x(x + 1) + 2(x + 1)\) or \(x(5x + 2) + [1](5x + 2)\) | Condone missing final bracket for up to full marks Up to full marks can be awarded for solving using non-integer factorisations such as \(5(x + 0.4)(x + 1)\) oe NB Working backwards from the answers scores only the final mark e.g. \((x + 0.4)(x + 1) = 0\) without seeing a factor of 5 or division by 5 leading to –0.4 and –1 Any other method, award B1 for both answers correct |
| –0.4 oe and –1 | 1 | Correct or FT their two factors | |