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How it marked a real Pearson Edexcel IAL Pure Mathematics 1 (WMA11), October 2022 script
Whole paper: 46/75.
- 7(a) Range of x for which f(x) < 6, from the graph: 1/3. The outer regions x < −4 and x > 3 are identified (B1, benefit of doubt). The inner region is given in words, not as −1 < x < 2, so M0 A0.
- 7(b) Largest solution of f(2x) = 6: 1/1. Correct largest solution. B1.
- 8(b) Area of triangle AOB: 2/2. Valid ½ab sin C using the base angle π/6, giving the correct exact area. M1 A1.
- 8(c) Show that AB = 3√3 m: 1/2. Correct cosine rule set-up earns M1. It jumps to the given answer without showing AB² = 27, so A0.
- 8(d) Total area of the pond surface: 0/5. Triangle ABC is omitted entirely, so all marks are lost. The answer should be about 43.
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