Question 37
Binomial TheoremFind the constant term in the binomial expansion of (2x2 + 1/x)9.
- A.84
- B.168
- C.336
- D.672
Show the answer and explanation
Answer: D (672)
Explanation
The term ⁹Cᵣ(2x²)^(9 − r)(1/x)ʳ has power 18 − 3r, which is 0 when r = 6: ⁹C₆ × 2³ = 84 × 8 = 672.