Expand the following expressions in ascending powers of x as far as the 4th term. 1.(3x-7)^20 (識做)可以去到幾散? Find the terms as indicated in the following binormial expansions. 2.(x^2-2/x)^10, the coefficient of x^2.
MarkChan
2007-10-29 20:46
你F.幾?
dinlo
2007-10-29 20:51
引用第1樓謝拉特於2007-10-29 20:46發表的“”: 你F.幾?
F.4
英俊
2007-10-29 21:23
Expand the following expressions in ascending powers of x as far as the 4th term.
第四項定係x^4 的係數?
dinlo
2007-10-29 21:25
引用第3樓handsome 仔於2007-10-29 21:23發表的“”: Expand the following expressions in ascending powers of x as far as the 4th term. 第四項定係x^4 的係數? [表情]
第四項
kylau
2007-10-29 22:43
I try Q1, u try Q2 yourself
These kinds of Qs need to use nCr
(3x-7)^20
= (7-3x)^20
= 7^20 - (20C1) (3x)(7^19) + (20C2) [(3x)^2] (7^18) + .... (there is 1 more terms u need, x^3, do it yourself)
