Soldato
- Joined
- 18 Mar 2008
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Core 1 maths help?
Thank you for anyone who answers this.
Find the coefficient of x^6 in the expansion of (1+3x)^12
By my reckoning that is the Pascal's Triangle number x 3x^6 x 1 ^6
The Pascal's Triangle number is:
(12 x 11 x 10 x 9 x 8 x 7) / (1 x 2 x 3 x 4 x 5 x 6) = 308
so the answer is 924x^6 ?
Also, to find the x^7 coefficient in the expansion of (1-2x)^15, is it just the same, only with a negative sign?
Thanks
Thank you for anyone who answers this.
Find the coefficient of x^6 in the expansion of (1+3x)^12
By my reckoning that is the Pascal's Triangle number x 3x^6 x 1 ^6
The Pascal's Triangle number is:
(12 x 11 x 10 x 9 x 8 x 7) / (1 x 2 x 3 x 4 x 5 x 6) = 308
so the answer is 924x^6 ?
Also, to find the x^7 coefficient in the expansion of (1-2x)^15, is it just the same, only with a negative sign?
Thanks
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