Question 27
Binomial TheoremFind the coefficient of x3 in the binomial expansion of (m − 5x)7
- A.−4375m4
- B.−4375m3
- C.−1275m4
- D.−1275m3
Show the answer and explanation
Answer: A (−4375m4)
Explanation
The x³ term is ⁷C₃ m⁴(−5x)³ = 35 × (−125)m⁴x³ = −4375m⁴x³.