help me please.... (1 Viewer)

[laurajm]

binomial theorm

heres the deal:i just want to check my answer- im not quite sure if its right:

find the Tr+1 and Tr terms of the expansion of (3 + 2x)^8
hence find an expression for :

T r+ 1 / Tr
in the simplest term possible

thanks

 

[allybee]

:wave: you have it all wrong
u'll hav to start it all again for sure

 

[SoulSearcher]

You could help out you know

The general term for that expansion should be:
⁸C_k3^8-k2^kx^k, where k is the number of the term in the expansion.

From there, substitute k = r+1 and k = r into that general equation, then divide the term with k=r+1 by k=r, then simplify.

 

[laurajm]

thanks. thats what i did but i wasnt quite sure