Question 24
Binomial TheoremFind the coefficient of y2 in the binomial expansion of (y − 2x)5.
- A.80x3
- B.80x2
- C.−80x2
- D.−80x3
Show the answer and explanation
Answer: D (−80x3)
Explanation
The y² term is ⁵C₃ y²(−2x)³ = 10 × (−8x³)y², so its coefficient is −80x³.