WAEC Further Mathematics 2025 Objective — Question 27
Question 27 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2025 Objective paper, with the correct answer and a full explanation.
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Find the coefficient of x³ in the binomial expansion of (m-5x)⁷.
- A. -4375 m⁴Correct
- B. -4375 m³
- C. -1275 m⁴
- D. -1275 m³
Explanation
The term with x³ is C(7,3) m⁴(-5x)³ = 35 × m⁴ × (-125x³) = -4375 m⁴x³, so the coefficient is -4375 m⁴.
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