WAEC Further Mathematics 2022 Objective — Question 25
Question 25 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2022 Objective paper, with the correct answer and a full explanation.
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Find the coefficient of x³y² in the binomial expansion of (x−2y)⁵.
- A. −80
- B. −10
- C. 40Correct
- D. 80
Explanation
The term in x³y² is ⁵C₂x³(−2y)² = 10x³(4y²) = 40x³y², so the coefficient is 40.
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