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# C2 Binomial expansion watch

1. https://b940eb267c31463d4d23ccfd3105...%20Edexcel.pdf

I've gotten the terms -6x and 15x² from the not sure where to go from there though
2. (Original post by thefatone)
https://b940eb267c31463d4d23ccfd3105...%20Edexcel.pdf

I've gotten the terms -6x and 15x² from the not sure where to go from there though
Write (1+x)(1-6x + 15x^2 + ...) and expand that...?
3. (Original post by Zacken)
Write (1+x)(1-6x + 15x^2 + ...) and expand that...?
i need to include this too?

I see ok so you get

1-6x+15x²+x-6x²+15x³
so
1-6x+9x²+15x³
right so it's 9.....

thanks a bunch i know i can always rely on you to help o.o i'm doing so badly on these solomon C2 xD
4. (Original post by thefatone)
i need to include this too?

I see ok so you get

1-6x+15x²+x-6x²+15x³
so
1-6x+9x²+15x³
right so it's 9.....

thanks a bunch i know i can always rely on you to help o.o i'm doing so badly on these solomon C2 xD
Yep.

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