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How it marked a real Pearson Edexcel IAL Pure Mathematics 1 (WMA11), October 2022 script
Whole paper: 48/75.
- 7(a) Range of x for which f(x) < 6, from the graph: 3/3. Both ends of the inside region and the outer regions are correct, so M1 A1 B1.
- 7(b) Largest solution of f(2x) = 6: 1/1. Correct: the largest solution is x = 3/2.
- 8(b) Area of triangle AOB: 2/2. A valid area formula with the correct sides and angle, giving 9√3/4.
- 8(c) Show that AB = 3√3 m: 1/2. The cosine rule method is correct (M1). No simplified intermediate such as AB² = 27 is shown, so the A1* is withheld.
- 8(d) Total area of the pond surface: 0/5. Triangle ABC was never found, so the total of 23 is wrong; the required total is about 43.
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