Question

for the expansion of (x+4)^(8) , find the sixth term

Answer 1

The binomial coefficients follow the rows of Pascal's triangle. Look at this article for more information under the third section: http://en.wikipedia.org/wiki/Binomial_coefficient

Answer 2

For (a+b)^n, the rth term in its expansion will be
\[\large T_r = ^nC_{r-1}a^{n-(r-1)}b^{r-1}\]

Use this^