Higher June 2024 Paper 5 Q13
13 Solve the inequality.
\(x^2 - 100 \geqslant 0\). [3]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| Both inequalities \(x \geqslant 10\) , \(x \leqslant -10\) as final answer | 3 | Allow 3 marks for \(-10 \geqslant x \geqslant 10\) final answer | |
| B2 for answer one of \(x \geqslant 10\) or \(x \leqslant -10\) | B2 implied by answer e.g. \(-10 \leqslant x \geqslant 10\) or \(x \geqslant \pm 10\) as one element of inequality correct | ||
| or M1 for \(x^2 \geqslant 100\) or for \((x + 10)(x - 10)\) | M1 implied by 10 or –10 seen in answer | ||