Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The coefficient of x 4 in the expansion of (l - x - 2x 2 ) is
Text Solution
Verified by ExpertsThe correct answer is:
D
-154
(l-x(l + 2x)) 8
= 1 - 8 C 1 x(1 + 2x) + 8 C 2 x 2 (l + 2x) 2
- 8 C 3 x 3 (l + 2x) 3 + 8 C 4 x 4 (l + 2x) 4 .........
The coefficient of x 4 is
8 C 2 .2 2 - 8 C 3 -2.3+ 8 C 4
= 112 - 336 + 70 =-154
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