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# Maths Help please watch

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1. Hello!
Could someone please help me on q 9 on the posted picture (binomial expansion). n=8 but idk how to get that.
Thank youuu
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2. (Original post by Jahayna)
Hello!
Could someone please help me on q 9 on the posted picture (binomial expansion). n=8 but idk how to get that.
Thank youuu
The coefficient of x^2 (in terms of n) = 7.

Can you write that equation?
3. (Original post by BuryMathsTutor)
The coefficient of x^2 (in terms of n) = 7.

Can you write that equation?
What do you mean?
I thought of it that way but got stuck:

Y * (x/2)^2 = 7x^2
So y= 14
So 14 must be the 3rd digit of the row n on pascals triangle
So
1
n
14
But idk how to find n afterwards
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4. Wait nvm i dont think thats right
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5. (Original post by Jahayna)
What do you mean?
I thought of it that way but got stuck:

Y * (x/2)^2 = 7x^2
So y= 14
So 14 must be the 3rd digit of the row n on pascals triangle
So
1
n
14
But idk how to find n afterwards
First of all (x/2)^2 = x^2/4.

You would be better off writing nC2 rather than Y.
6. I really dont get it sorry.
Could you please send me your working out if you can?
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7. (Original post by Jahayna)
I really dont get it sorry.
Could you please send me your working out if you can?
Here are some brief notes, followed by an example similar to your problem.
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