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# C2 Help?! watch

1. (Original post by ramshahk)
i didnt find out n
Okay.
In terms of n, you can see that:
(n^2 - n)/2 * (x/2)^2 = 30x^2.
This was found by the binomial expansion formula in your formula book.
You need to solve this equation to find n.
2. (Original post by surina16)
Okay.
In terms of n, you can see that:
(n^2 - n)/2 * (x/2)^2 = 30x^2.
This was found by the binomial expansion formula in your formula book.
You need to solve this equation to find n.
i get n=30/8
3. (Original post by ramshahk)
i get n=30/8
That's not right.

You're solving so check your working.
4. (Original post by ramshahk)
i get n=30/8
Could you post your working so we can see where you went wrong? n is an integer.

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