(a-2)^7
a^7 - 14 a^6 + 84 a^5 - 280 a^4 + 560 a^3 - 672 a^2 + 448 a - 128 The second term of that is -14a6
The second term is given by :
- [ C(7,1) * a^6 * 2 ] =
- [ 7 a^6 * 2 ] =
-14a^6
+5265 +5265 
