Question 16
Binomial TheoremFind the coefficient of x3 in the binomial expansion of (1 − 3x)5.
- A.270
- B.240
- C.−240
- D.−270
Show the answer and explanation
Answer: D (−270)
Explanation
The x³ term is ⁵C₃(−3x)³ = 10 × (−27)x³ = −270x³.
Find the coefficient of x3 in the binomial expansion of (1 − 3x)5.
Answer: D (−270)
The x³ term is ⁵C₃(−3x)³ = 10 × (−27)x³ = −270x³.