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# Need Help with Binomial expansion coefficient q watch

1. I have to find the coefficient of x^17 for

So first I write it out

After re arranging I get 105-8k=17 so K isnt a very nice number!

Ive used this method on other expansions and its been fine?

Any help would be appreciated, thank you
2. (Original post by tigerz)
I have to find the coefficient of x^17 for

So first I write it out

After re arranging I get 105-8k=17 so K isnt a very nice number!

Ive used this method on other expansions and its been fine?

Any help would be appreciated, thank you

you get k=11
3. (Original post by TeeEm)

you get k=11
*facepalm* I did the difficult bit and messed up with the re arrangement >.<

Thank youu
4. (Original post by tigerz)
*facepalm* I did the difficult bit and messed up with the re arrangement >.<

Thank youu
no worries

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