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How it marked a real Pearson Edexcel IAL Pure Mathematics 1 (WMA11), October 2022 script
Whole paper: 45/75.
- 7(a) Range of x for which f(x) < 6, from the graph: 0/3. The scheme requires inequalities in terms of x; a verbal description without inequalities in x does not score M1, A1 or B1.
- 7(b) Largest solution of f(2x) = 6: 1/1. Correct largest solution x = 1.5: B1.
- 8(b) Area of triangle AOB: 2/2. Valid ½ab sin C using AB = 3√3, OA = 3 and angle π/6, giving the correct exact area: M1 A1.
- 8(c) Show that AB = 3√3 m: 1/2. M1 for the correct cosine rule; A0 because for a “show that” the intermediate value (c² = 27 or c = √27) must be seen before 3√3.
- 8(d) Total area of the pond surface: 0/5. Triangle ABC was never found (no sine rule, angle or area), so the total of 23 m² leaves out a whole region: no marks.
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